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Thanks for the tips. It's definitely not the motor itself, when the focuser is removed from the telescope it revolves happily with no obstruction. It's something to do with the motor's interaction with the telescope.
I think VP might be onto something here, the silver bracket of the motor that grips the spindle might be rubbing on the telescope, though I swear it completes more than a full revolution before binding (you'd think it would jam at the same point on every revolution).
I'll check it out tonight and let you know if that resolves it.
Thanks again!
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