To help your pitchers get better movement on their Screwballs have them focus on leading with the thumb into the release. This helps position the hand better for a more complete finish of the snap instead of a common screwball mistake which is an over-twist of the hand entering the snap.
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What does leading with the thumb do that helps the pitch to become a better screwball?
it helps the pitcher’s hand start in the correct position to twist the ball to the right (if a righty) when releasing the screwball. Most pitchers have their thumb facing down when starting their screwball release which makes the pitch act more like a riseball