It’s essential to have a relaxed grip on the ball. This is the real secret to a free flowing armswing! Relax your grip more and more until it feels like you’re barely hanging onto the ball. This will help you get over any fear of dropping the ball. Keep your fingers, and especially your thumb, relaxed throughout your entire swing.
When you have your ball drilled, make sure the fit is snug enough so that you can keep your fingers and thumb relaxed at all times.