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El if you get the chance to have a look at a JMI NGF-CM focuser. To switch from motorized to manual is simplicity itself. The motor is mounted internally but you should be able to work out something similar. There is s screw on the bottom of the housing that when you unscrew it slightly the the bottom of the housing drops down (its under spring pressure) and disengages the motor gear from the fosuser gear. When you want to use the motor again you just tighten up the screw to re-engage the two gears. You would loose your counter but there would be no pressure on the stepper motor at all, it being disengaged
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