I had one until last weekend, Dave.
Not much to it.
Remove the original knob and focus surround, and replace with the Motofocus surround and appropriate knob.
The motofocus itself slides over the new knob and the thumb screw on the side locates it on the new surround.
It will take a while to go flat when doing nothing, but i used to disconnect the handcontroller/battery from the motor when not in use to preserve battery life.
Al.
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