Clipping the thumb usually = stop prematurely turning the hand.
As the loudmouth on Sundays puts it..."work the inside of the ball".
A helpful grip adjustment, from a properly fit grip, would be to shorten the MF 1/16 and add 3/8 forward pitch. Next step would be to lengthen the RF 1/16 and add 3/8 reverse pitch. Yes, this is the "Mo/Del claw" adjustment.
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good luck and good bowling.
Edited on 11/14/2008 9:08 PM