What Is a Low Deflection Shaft? Squirt Explained
A low-deflection shaft is a shaft with less weight in its last few inches, so the cue ball squirts less off your aiming line when you use side spin. How much less? Dr. Dave Alciatore's measurements put a typical LD shaft at about 1.8 degrees of squirt near maximum english, against about 2.5 degrees for a typical regular shaft. That's roughly 30% less, which is real but smaller than most marketing suggests.
This page explains where squirt comes from, what an LD shaft changes and what it can't, the myths that keep circulating, and who should switch. If you've already decided to buy one, go straight to our best low-deflection shafts comparison.
What squirt is, and why "low deflection" is a confusing name
Hit the cue ball left of center and it leaves the tip slightly to the right of where the cue was pointing. Hit it right of center and it goes slightly left. That sideways push is squirt, and players also call it cue ball deflection. The farther from center you hit, the bigger the angle.
The name "low-deflection shaft" causes some confusion. The shaft itself actually deflects more: its light tip end gets pushed aside easily by the ball. Because the shaft gets out of the way, the cue ball deflects less. Dr. Dave prefers the term low-squirt shaft for that reason. LD, low-squirt and low-deflection all mean the same thing.
What causes it: mass in the last 5 to 8 inches
During the instant the tip is on the ball, an off-center hit pushes the end of the shaft sideways. The ball pushes back on the tip, and that equal and opposite push is what sends the cue ball off line. The more mass sitting at the end of the shaft, the harder it resists moving, and the more the cue ball gets shoved the other way.
Dr. Dave's testing at Colorado State found that only the last 5 to 8 inches of the shaft matter. Adding weight close to the tip raises squirt the most. Adding it farther back than that, or changing the butt, makes no difference to squirt at all. So a heavier butt, a different wrap or a weight bolt won't change how much your cue ball squirts.
Stiffness gets blamed a lot, but on its own it plays a small part. A stiffer front end lets the shock wave from the hit travel a little farther down the shaft during contact, which brings more mass into play. That's why a stiff carbon shaft with a light tip end can still squirt about as much as a slightly heavier wood shaft. Endmass is the thing to watch.
How makers take weight off the front end
Every LD design is a different route to the same goal: less mass near the tip. Dr. Dave lists the main levers as a smaller diameter, a drilled-out core at the tip end, a lighter tip, and a shorter, lighter or missing ferrule (ferrule material is heavier than maple). Here is how current shafts use them.
| Method | Examples from the makers' own pages |
|---|---|
| Spliced or laminated maple with a lightened front end | Predator 314-3 (10-piece maple; Predator says the front end is lighter and more flexible); Pechauer Performance Plus (12 pieces of hard rock maple); Jacoby Ultra Pro (140 rotary-cut veneers) |
| Lighter or shorter ferrule | Pechauer's "ultra light" 5/8-inch ferrule on the Performance Plus; Lucasi's Zero Flexpoint ferrule; McDermott Defy's 0.125-inch ferrule |
| Smaller tip diameter | Predator Z-3 at 11.85mm; McDermott i-3 at 11.75mm; Jacoby Super Pro at 11.75mm |
| Carbon core in a wood shaft | McDermott G-Core (carbon core in the first 7 inches); Predator Centro (maple with a front-end carbon core) |
| Hollow carbon tube, little or no ferrule | Predator Revo (ferruleless); Cuetec Cynergy (foam core that stops short of the tip, leaving a hollow front end) |
One practical rule follows from this. When a shop replaces the ferrule on an LD shaft, ask for the same length and material it came with. A longer, heavier generic ferrule adds mass right where it hurts. Our ferrule guide covers that job.
How much less squirt? The honest numbers
Dr. Dave's September 2007 Billiards Digest article measured about 1.8 degrees of squirt for a common LD shaft near maximum tip offset, compared with about 2.5 degrees for a typical regular shaft. He sums it up as roughly 30% less squirt. Ron Shepard's earlier paper reported a wider spread, from about 0.5 degrees for low-squirt cues up to 2.3 degrees for high-squirt ones, though Dr. Dave considers the low end of that range too optimistic.
Makers quote bigger figures. Predator says its Revo carbon shafts cut cue ball deflection by 80% compared with a standard maple shaft. That's Predator's claim, measured Predator's way, and against "standard maple" rather than another LD shaft. Dr. Dave publishes rules for fair squirt testing (same tip on every shaft, a level cue, the cue ball measured directly instead of through an object ball, and an independent tester rather than a manufacturer), and few published numbers meet all of them.
Treat any single number with some care. Shafts of the same model vary a little, tip shape and hardness change the result, and Dr. Dave's carbon testing shows that not all carbon shafts squirt the same amount.
Robot test data: how far shafts sent the cue ball off line
The most complete public table comes from Platinum Billiards, an independent company that tested shafts on a cue-testing robot around 2008. Dr. Dave reproduces it on his published-data page. Each shaft was tested as sold, at about 15 mph, with hits 6 and 12mm off center, and the cue ball's average miss was measured at a target 50 inches away. A selection:
| Shaft (as tested, about 2008) | Average miss over 50 in | Platinum's rating |
|---|---|---|
| Predator Z-2 | 29.6mm (1.17 in) | Low |
| Predator 314-2 | 33.0mm (1.30 in) | Low |
| Predator 314 | 34.8mm (1.37 in) | Low |
| McDermott i-3 | 36.8mm (1.45 in) | Low |
| McDermott i-2 | 38.6mm (1.52 in) | Medium low |
| Meucci Red Dot | 40.1mm (1.58 in) | Medium low |
| Standard McDermott and Mezz shafts | 42.9mm (1.69 in) | Medium |
| Players | 43.4mm (1.71 in) | Medium |
| Lucasi (standard) | 44.7mm (1.76 in) | Medium high |
| Scorpion break cue | 51.3mm (2.02 in) | High |
Three cautions. These are older generations: the 314-2 and Z-2 have been replaced by the 314-3 and Z-3, and none of today's carbon shafts are in the table. Platinum itself says samples of one model vary. And the whole spread among playing shafts is well under an inch over 50 inches, which is why a good player can play well with almost any of these shafts once they know it.
A newer test: carbon vs LD maple
In his January 2019 Billiards Digest column, Dr. Dave measured natural pivot lengths for four shafts. A longer pivot length means less squirt.
| Shaft | Natural pivot length |
|---|---|
| Predator Revo 12.4 (carbon) | 19 in |
| Predator Z-2 (LD maple) | 19 in |
| Cuetec CT-15K, now sold as the Cynergy (carbon) | 13 in |
| Players cue, solid maple with a large ferrule | 9.5 in |
The older Z-2 maple shaft squirted about the same as the Revo, and the Cuetec squirted more than both, though still clearly less than the standard maple shaft. Dr. Dave adds that some players may prefer the Cuetec's extra squirt because it's closer to what they're used to. The lesson: carbon versus wood doesn't decide the number. The front end does.
Squirt, swerve and throw: what an LD shaft fixes and what it doesn't
Three separate things move a side-spin shot off line, and an LD shaft only changes the first one.
- Squirt is the instant sideways push off the tip. It's set by the shaft and the tip offset. This is the part an LD shaft reduces.
- Swerve is the curve that follows, as the spin grips the cloth and bends the cue ball back toward the spin side. It depends on speed, distance, cue elevation, and the condition of the balls and cloth. Slow shots swerve more, and so do shots with the butt raised.
- Throw is the object ball being pushed off its cut line by spin and friction at contact. It changes with the cut angle and the speed, and with the kind of spin.
Dr. Dave makes a point that surprises people: over a wide range of shots, swerve (not squirt) is what makes aiming with english hard. Your shaft has nothing to do with swerve. So even with the lowest-squirt shaft available, you still have to learn how much a slow, long, outside-english shot curves. Our guide to putting english on the cue ball covers that side of it.
Natural pivot length and back-hand english
Every shaft has a natural pivot length: the bridge distance at which pivoting the cue to apply side spin (back-hand english) exactly cancels its squirt. Set your bridge there, aim center ball, pivot the butt to put english on, and on a firm, short shot the cue ball goes where you first aimed.
Platinum's data put pivot lengths at roughly 8 inches for high-squirt cues and about 14 inches for low-squirt ones. Predator says its Revo playing shafts pivot at about 19 inches. A longer pivot length means less squirt. It also means that, for an LD shaft, the pivot point is often well behind where most people bridge, so back-hand english on its own undercorrects.
How to find your own shaft's pivot length
- Put the cue ball a short distance from a target, such as a ball on the far side of a diamond, so swerve has little room to act.
- Keep the cue as level as you can and aim dead center at the target.
- Without moving your bridge hand, pivot the butt so the tip sits a fixed amount off center, then shoot firmly.
- If the cue ball misses on the side you put english on, move your bridge hand back and repeat. If it misses on the other side, move it forward.
- When the ball goes straight to the target, measure from the tip to your bridge. That's the shaft's pivot length.
Dr. Dave points out that most intermediate and better players don't need a shaft matched to their bridge, because their strokes are already straight. Where a matched pivot length helps most is on fast shots where the stroke tends to wander, such as the break.
Myths about LD shafts
| Myth | What's actually true |
|---|---|
| An LD shaft puts more spin on the ball | No. For the same contact point it gives a tiny bit more spin (2 to 3%, per Dr. Dave), but a regular shaft can hit farther out before miscuing, so the maximum spin is the same. |
| A thinner tip gives more spin | It only seems that way. With a slimmer tip, players tend to hit farther from center without noticing. Spin depends on where the tip contacts the ball. |
| Stiffer shafts squirt more | Stiffness has a small direct effect. Mass at the tip end is what counts. |
| The butt and wrap change squirt | Nothing beyond the last 5 to 8 inches of the shaft affects squirt. |
| Carbon means lowest squirt | Most carbon shafts are low squirt, but they differ. In Dr. Dave's 2019 test a Predator Z-2 maple shaft matched the Revo, and the Cuetec CT-15K carbon shaft squirted more than both. |
| LD is better for everyone | Not for a player who has used a regular shaft for years and compensates well. Switching costs a period of misses. |
| You won't need to change how you aim | You will. Your old squirt allowance is now too large. |
Who an LD shaft helps, and who should skip it
It helps most if you use side spin for position and your misses come on long shots with english, when the cue ball starts slightly off line. Less squirt means a smaller correction, and a smaller correction is easier to get right. It also helps a newer player who doesn't compensate at all, because unintended english from a slightly off-center hit costs less.
It helps least if you play mostly center ball, or if you've played for years with a regular shaft and already make your english shots. Dr. Dave's advice to that player is blunt: don't switch. Pick a shaft you like and stay with it, because time with one shaft is worth more than a few tenths of a degree.
The downsides Dr. Dave lists are worth reading before you spend the money:
- LD shafts cost more than standard maple.
- Relearning your aim takes time, and a house cue will feel off afterward.
- Some LD maple shafts, especially with soft tips, make jumping and massé harder. If you jump with your playing cue, factor that in or use a jump cue.
- Small diameters and some tapers feel thin in a closed bridge.
- A lightened maple tip end may not be as tough over many years.
- Some players don't like the hit, sound or look.
Switching: how to recalibrate
The miss pattern is predictable. With a regular shaft you learned to aim a little toward the english side to cancel squirt. With an LD shaft that allowance is too big, so you'll overcut toward the side you're spinning, most of all on long shots.
Spend a few practice sessions on one drill before league night: a long, fairly straight shot with left english, then the same with right, at two or three speeds. Note where the cue ball actually starts and shrink your allowance until it goes in. Keep the same tip type you had, at least at first, because tip hardness and shape also change squirt a little, and you only want one new variable. Don't make the switch the week before a tournament.
If you're still choosing between wood LD and carbon, our wood vs carbon fiber guide and are carbon fiber shafts worth it cover the feel and care differences. Tip diameter is covered in the tip size guide.
Sources
- Dr. Dave Alciatore: low-squirt (LD) shafts, advantages and disadvantages
- Dr. Dave Alciatore: shaft endmass and stiffness effects
- Dr. Dave Alciatore: natural pivot length
- Dr. Dave Alciatore: published squirt data (Platinum Billiards robot tests)
- Dr. Dave Alciatore: squirt robot testing and testing rules
- Dr. Dave Alciatore, "Pool Myths, Part 4: LD Shafts," Billiards Digest, September 2017
- Dr. Dave Alciatore, "The Carbon Fiber Shaft Craze," Billiards Digest, January 2019
- Dr. Dave Alciatore: carbon fiber shafts
- Predator: why low deflection is better (maker claims)
- Predator: shaft comparison
- McDermott: shaft lineup
- Pechauer: Performance Plus shaft
Our picks
Links open the current selection and price on Amazon so you can compare real reviews before buying.
Predator 314-3 Maple Shaft, 3/8x10
The classic wood LD shaftPredator's 10-piece maple shaft with a lighter, more flexible front end, built so the cue ball can push the shaft aside instead of squirting off line. This listing is the 3/8x10 version, which fits 3/8x10 butts such as most threaded McDermotts.
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Lucasi Zero Flexpoint Shaft, Uni-Loc
LD maple for Uni-Loc buttsA solid-core low-deflection maple shaft with a 12.75mm Everest laminated tip and a taper designed by Thorsten Hohmann. This listing is the Uni-Loc quick-release version. Lucasi has used both Uni-Loc quick release and Uni-Loc Radial, so check which one your butt has.
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IgnatGames 58 in. Maple Cue with Low-Deflection Shaft
Trying LD on a budgetA complete 20 oz two-piece Canadian maple cue sold with a low-deflection shaft, a 12.5mm leather tip and a 5/16x18 joint, plus a hard case and a 10-year warranty after registration. A cheap way to find out whether you like the LD feel before buying a name-brand shaft.
Check price on AmazonFrequently asked questions
What does a low-deflection shaft do?
It reduces squirt, the sideways push the cue ball gets when you hit it off center for side spin. With less squirt, the cue ball starts closer to your aiming line, so you need a smaller aim correction on english shots.
How much less does an LD shaft deflect?
Dr. Dave Alciatore measured about 1.8 degrees of squirt for a typical LD shaft near maximum english, against about 2.5 degrees for a typical regular shaft, roughly 30% less. Makers quote larger figures measured their own way.
Is low deflection the same as low squirt?
Yes. Both terms describe a shaft with less mass at the tip end. Low squirt is the more accurate name, since the shaft itself moves aside more while the cue ball deflects less.
Does a low-deflection shaft give you more spin?
No. It gives a tiny bit more spin for the same contact point, but a regular shaft can hit farther out before miscuing, so the maximum spin you can put on the ball is the same.
Does the butt or the wrap affect deflection?
No. Squirt depends on the last 5 to 8 inches of the shaft. The butt can change your stroke speed, which affects swerve, but not squirt.
Should a beginner use a low-deflection shaft?
It can help a little, because a beginner doesn't compensate for squirt and an LD shaft sends the cue ball closer to the aim line. But it won't fix aim or stroke problems, and lessons or table time will do more for the same money.
Why am I missing after switching to an LD shaft?
You're still aiming with the allowance you learned for a shaft that squirted more, so you overcorrect toward the english side. Practice long english shots at a few speeds and shrink the allowance until they go in.
Are carbon fiber shafts always low deflection?
Most are, but not all carbon shafts squirt the same amount. In Dr. Dave Alciatore's 2019 test, a Predator Z-2 maple shaft squirted about the same as a Predator Revo, and a Cuetec CT-15K carbon shaft squirted more than both.
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