The field of the invention is sporting goods and the invention relates more particularly to the sport of bowling. It is well known that the thumb size of a bowler varies during bowling. Typically, it decreases slightly in size and the serious bowler would like to be able to adjust the size of the thumb hole to an optimum size during bowling. Numerous methods have been used for accomplishing this desired result.
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Image credit. Historically, the anatomical nature of the human thumb has presented an enigma for pro shop operators, coaches, and players. With orthodox drilling methods, it is difficult to obtain a fit which prevents the bending of the thumb at the bottom of the hole while fitting the hole well at the top. The thumbhole will fit at the top or fit at the bottom but not both. Thus, bowlers must bend the thumb at the knuckle to grip and swing the ball as it enters into the swing, throughout the swing, and into the release. This will delay the exit of the thumb. On the other hand, taping a hole with full pieces of tape, which creates a good fit at the tip of the thumb, would create a hole which is too tight at the top, also delaying the release since the tape acts like a braking mechanism.
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A built up layer of oil on your ball can cause it to react differently with the lane. This often causes your ball to lose grip on the lane, which can hurt your throw. However, you can easily remove this oil with a little bit of time and some household products.