Your thumb hole may be too big, causing you to grip the ball, putting pressure at your thumb base.
I use a slight bevel, and white tape, placed at the front of the hole, about 2-3cm below the edge of the thumb hole. If you put tape all the way up to the edge, your thumb base, you may have problem releasing your ball
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I like my coffee black, just like my metal.
What would Chuck Norris do?
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Cute Bunny! copy bunny into sig to help him achieve world domination