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Here is what the motofocus looks like on an old c8 .
This must have a patent owned by JMI , now owned by Farpoint Astro. The key seems to be the fairly precise friction fit of shaft collet and close , but not too tight fit of plastic tube.
Also the motodec which is essentially the same thing on some models. Shown with a home made bracket made from plumbing fittings as I could not buy the correct stepper motor or bracket for my model handset. Plugs into the focus port and I can swap them over for final focus.
I think I will change this to a $20 stepper motor now I have sorted out what is required.
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