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Update:
Droped the alt knob off to be duplicated today and attached the worm gear to the azimuth axis
as you can see i have tried to keep it simple and relatively compact ... there is enough room for the stepper to reach the gear without impinging upon the mount itself.
I bored into the alt knob instead of my original idea of attaching the worm gear directly to the azimuth screw because the worm is just ever to big to fit. This i think will be better in the long run for the extra room it grants plus it means i don't have to thread the plastic and can still use the knob if the worm is not engaged.
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