I use hockey pucks, the NHL wasn't using them so I figure I will

, to help young players to feel the release point and understand rotation. Once they feel their fingers on top I switch them to a ball with, Dah Duh Dah Hockey tape, again a very little used resource

, for a stripe. I alternate two colors to help the kid throwing the ball see the rotation. They also get the visual aid of having the stripe to line up their fingers for a proper four seam fastball.
CSUF, I like CSUF and the way they do things so I copy their program allot, uses the term 'cobra' to help young players understand the fingers need to be on top of the ball, this would be the opposite of what i think 'pie thrower' means fingers under the ball. So what do you guys use as coaching aids to help a young player learn proper mechanics?