Hey guys, so I have been going through the same problem all this season and it needs to stop! I bowled a 6 game tourney yesturday and at the end coudn't even hold on to the ball. The problem is my thumb rubs like mad on the inner (index finger side) of the knuckle, and it gets blistered up bad, and fast. Currectly my pitches are 1/4 reverse and 1/8 left, they obviously need to be changed (thinking some forward pitch) and a good friend of mine also noted that I may want to see if I can get the thumb moved more offset to try and take pressure off that side of my thumb at release. This blistering has always haunted me but NEVER this bad and it needs to STOP before I go to state/pepsi/nationals. Any advice would be appreciated. Thanks --