Expert: Chip Aki - 10/6/2006

Question
my bowling balls all cause me to have a calleous on my thumb.calleous is located on left side of thumb and cintinues to the back left side of thumb.apparantly when i release the ball.my thumb must drag on the back of thumb hole,causing thgis calleous.what type of thumb pitch do i need? i am right handed

Answer
The usuall pitch change reccommendation would be to adjust the pitch in the direction you are creating the callous.  It looks like you might need to add some left latteral and some reverse.  I would have your pro shop take a look at it to be sure.

Good luck,
Chip