Gripping the ball with your thumb can be a hard habit to break. What you should be doing is gripping the ball with your middle and ring finger and press your index finger and pinkie on top of the ball. Doing this will keep your wrist cupped or straight and it stays that way into the release. All the thumb does is take up space in the thumb hole. When the thumb isn't gripping the thumb will come out quickly near the release and that will let the ball fly off the tips of your bent fingertips as you hand quickly goes forward through the end of the swing. If you grip with the thumb as you are coming to the release you will lose accuracy to your target, lose revs and it could possibley cause you to pull your shot. You want to leave the thumb lying flat in the thumb hole and not pressing down on the thumb in the hole which will cause the thumb knuckle to rise and touch the other side of the hole which will cause it to stick. There are bad releases that can cause a thumb to stick even if the hole is drilled correctly.
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