But again, to have a pitcher impart more spin on the ball upon release...what is your cue or preferred drill?
You are asking how to throw a drop ball.
With internal rotation, the arm is basically a worm gear and the ball is a toothed gear. Here is a video about worm gears and toothed gears.
The faster the forearm, which is like a worm gear, rotates the faster the ball, which is like the toothed gear, rotates.
You are asking about "pitcher cues," which means things you tell a pitcher to "feel" the correct motion. A cues does not necessarily describe the actual motion.
Remember that the ball should be on top of the hand at 9 and behind the ball at 6. This requires rotation of the forearm, which is the "internal rotation" everyone talks about.
So, the pitcher can either think of (1) delaying/slowing the IR as long as possible, which results in a sudden explosion of IR to get the palm to 6, (2) speeding up IR or (3) releasing the ball earlier.
Conceptually, "releasing the ball earlier" seems easier to understand.
My DD developed a drill to improve her spin and timing for a drop. Note (1) she starts the drill with the palm facing 3B at about 7 and (2) the release point in the drill is *BEHIND* her hip...so, she is practicing "releasing the ball earlier". (As an FYI, the drill is done correctly when the ball comes straight up, not when it shoots forward. The drill is mainly about timing.)
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