1. yes when my finger knuckle was healthy i could go back and forth between the amount of hand i could put into a ball, for me though i have two methods of follow through, i punch up with a closed fist which tend to generate more revs, or i follow through slowly with an open hand which reduces my revs. this helps a bowler if he/she only have 1 ball, but if you have multiple balls and can "ball down" instead of change then that is what i prefer, that way your release is always consistent.
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