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if you haven't already seen the doco 'seeing in the dark' try to chase it down, theres a guy that made a slow mo control for his dob using a bicycle brake lever, squeeze it and it will move the base in azimuth.
although he doesn't go into detail how it works you could probably pick up pretty easily what he's done. also the way he did it, it doesn't need to be reset as if you kept going with the brake lever it would do a 360 and keep going.
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