What's the big deal about performance cues and low deflection shafts? When you hit the cue ball with english, the cue ball will "squirt" away from its intended path. As a result, when you hit with english, you have to compensate for this "squirt".
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The purpose of the low deflection shaft is to reduce the amount of "squirt" so you don't have to overcompensate when hitting with english. There are a number of excellent cues and shafts that reduce cue ball deflection and as a result, make playing pool a little easier and definitely more enjoyable.