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Hmmmm.
Couldn't you just use a friction drive on a rubber covering on the focus knob? It should work OK and give you the advantage of being able to disengage it easily by pulling the spring loaded motor away from the focuser on a slide. This would be interchangable with the Crayford when you get it by just changing the speed of the stepper motor.
You are lucky to be able to understand stepper motors. That is one of the reasons I have not got back to my equatorial platform, the lack of fine control.
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