Hello John & Alan,
This is the doc that Ron Newman sent me when I was asking him about a better way to retain a manual option:
Moonlite CFL - Slip Clutch Option.doc
Of course Ron as usual was already ahead of the game.
Only comment I would make is that once you release the clutch, you loose your datum reference and you only have a single speed manual knob.
But you still have manual control say while you are setting up for imaging. If you want live manual control, I would suggest the Moonlite DRO Controller (USD300 more), or Astrogene's USB-nSTEP controller with optional manual control (for a lot less $$s). All include temperature compensation or an option for same.
David