Hey Chris
You are on a winner there. It looks like the Orion Accufocusser which I put on my std GSO crayford and LOVED IT immediately! No more big fat fingers wobbling the scope around at high mags! It is designed for an Orion rack&pinion focusser, so in your case should have been a more ready installation.
I've since moved the Accufocusser to a 10:1 focusser. It needed a bit more grunt to turn the additional gearing, but supergluing the "fuel filter" sleeve to the focusser shaft seems to have done the trick. No more slippage.
One thing I did was use only one grub screw to tighten it up, then replace that grub screw with a screw with a "top" I could get my fingers around (photo in a thread somewhere). In that way, I could loosen off the screw, thereby disconnecting the motor, and make coarse adjustments via the normal knob when I changed eyepieces that weren't parfocal. Then tighten it back up again and used the electric focusser for fine focus.
