You will definitely feel a difference with 1/8 change, hard to predict if it will cause a problem. It will make it easier to hang onto the ball, or harder to release - whichever way you want to think of it. It will also put more pressure on the area at the base of your thumb. If you have an old ball you don't use ask your driller to drill the grip on an area of the ball that won't interfere with the existing holes and try it. The ball won't be legal for competition, but it will give you a chance to feel the difference. -- JohnP