How snug should the thumb hole be? - Bowling Forums, Bowling Discussion and Bowling Talk - Bowling ball thumb
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It is the duty of the pro shop professional to custom fit your bowling ball to fit your hand. The thumb hole is as important, if not more important, than any gripping. Squeezing pushes the sides of your thumb out which makes the hole seem tighter than it actually is. This is the main reason why most bowlers feel they need to.