The hardest thing to get right to make the ball hook is to keep your hand behind the ball until your thumb comes out and then your fingers rotate an inch or two and come out last. Don't squeeze the ball tightly with your thumb either. Your thumb should stay flat inside the thumbhole and hold on lightly. You have to do this so the thumb comes out quickly at the release. A fingertip ball with finger grips is a good idea also. Good luck.
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