[apalrd]

I've never actually seen/worked with the SuperShifters, but I have seen the AM Shifters (the open ones). According to AndyMark, there is an extra stage of reduction on the SuperShifters, which I suspect is after the shifting stage, which is where your problem lies.

We are actually looking into the AM shifters for this, but the AM shifters don't have the extra reduction the SuperShifters have.

in the 2008 season of OCCRA, the Killer Bees built a clutch out of black steel pipe from Home Depot, by putting a piece of 3/4" mounted to the robot as an axle with two pieces of 1" outside them acting as a drum and motor attachment. One piece was fairly short and had a large chain sprocket running to the motor attached to it. The motor was a DeWalt motor, with integrated transmission. That pipe had a notch on the end that went to the other piece. The other piece was long, about 1 1/2' long, with the end cut off to make a notch that the other piece fit into. At the non-notched end of the pipe, we had a pipe flange sitting in a cut C-Channel that would pneumatically pull the second piece away from the first, allowing the clutch to release and the mechanism to fire.
The OCCRA example shows what students can do using no precision tools at all (it was made with a bandsaw and hand tools).
ASCII illustration to hopefully make things clearer:
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Please remember that OCCRA requires no precision machining at all, no welding, and only student work. Thus our devices are not perfect for FIRST robots.