Reddit mentions of MICHELIN Storm Thunder Tape

my friend has the same problem. he has issues because he squeezes the ball on his approach. this makes the thumb flare (get larger from side to side) and the ball sticks on the release.. he has a tendency to develop blisters on the inside and outside of his thumb. this causes swelling too, which makes the problem worse.

he has reslugged his ball 3 times just because he kept asking the driller to open it up, against the driller's advise, and had to close it back because the hole was simply too large and forcing him to squeeze the ball.

important to note that your thumb hole should be an oval and not a perfect circle. this is a common issue, but it depends on your thumb's shape and your driller.

another option is pitch. some PSO's won't bother with it. the short of it is... you can have your thumb hole (and finger holes, far less commom) pitched forward, back, left and right. normally, a PSO will drill the thumb hole straight into the ball, resulting in a hole where the centerline makes a 90 degree angle with the line tangent to the ball. this angle can be adjusted to optimize your release. i would suggest this as a last option because its kind of hit or miss. you need a good PDO/driller to know which way to go based on you grip. my friend did end up getting a slight pitch adjustment, but jury is still out (after like 16 weeks) if this helped or not. his release has improved over time.

idk where you live, but consider finding a PSO with IBPSIA certification. enter your state in the following link and try to find an advanced certified technician, or better. not to say a driller must be IBPSIA certified, but i stand by my PSO, who happens to be. he fit all three of my drills perfectly just from an old ball, its track, and checking my natural thumb position and thumb grip pressure when i squeezed his wrist. i can't tell the difference between any of the three balls and i have had zero issues. take this with a grain of salt because i would consider myself an advanced bowler with a relatively smooth and consistent release.

https://ibpsia.com/find-a-pro/technicians/find-a-technician-in-your-area/#

also..try to use some release tape, this stuff was a game changer for me..

https://www.amazon.com/Storm-S570-P-Thunder-Tape/dp/B00BUICA0O