[de_]

Note I was the original poster.
Thanks for some of the good ideas.

I'm really looking for someone who has used a stock supershifter with the stock shift block and shaft assembly and hopefully has significant experience with it (launched 50 balls would be nice).

Anyone thinking of using a past year supershifter should read the following.
A previous generation shift block assembly used a tiny roll pin which we have broken more than once in past years (as a transmission) with a standard 3/4 pneumatic cylinder (ie 24 lbs force). So for example we can't see how that pin could possibly survive the 102 lbs force of a 1.5" cylinder in a winch application.

Our new Super Shifters arrived today (basically free with the use of our PDV) and close inspection of the current shift block shows it is using a captured E Clip which should have many times the shear force strength of the tiny roll pin used before. The "captured" feature should mean the E clip cannot "back off" accidently, it can only shear off under normal operations.