Another comment - being over 60 and my tendons don't like to stretch.... Are you saying that the hand will rotate, that is that the wrist will rotate as done by Devaney and Malotte?

You don't really rotate around the side of the ball all that much, and the ball still does something similar to dropping off the fingers. You just help it by uncupping your wrist.

For whatever reason, people seem to think you have to rotate around the ball, and I think you'd find very few successful bowlers who actually rotate "around".

Malott doesn't rotate around the ball at all. He's pretty much up the back of it.

As shown in the video, the action of the wrist uncoiling from the inside position actual creates revolutions, not mid roll (what I call axis tilt). And, all of the players mentioned perform a motion similar to the one highlighted by Malott, above. They get there in different ways, but if you view a closeup, they all perform the same Slowinski motion.

Spare me, you should have your grip and span checked before trying this, you could pop a tendon in your hand or wrist if your grip is not right, especially if your span is stretched.

Keeping your hand inside the ball is dependent on keeping your bowling side shoulder back until the release, letting it come forward too soon will turn your hand around the outside of the ball.

Mid Roll as you described is called "Tilt" in bowling lingo.

Thanks, Coach Jim. It hurts me to do this arm twist even when not holding a ball, so I was planning to work on it at home until my tendons were stretched enough.

However, since I know for a fact that all of my balls were drilled about 1/4" too long a span, I will avoid actually doing this at the bowling center until I have a ball that's safe to use.