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Hi Leon, undo the two silver screw with an allen key. That holds the cover and the gearbox plate to the base plate. Then unscrew half of the oldham coupler and remove the gearbox. A good wack probably ripped the thread in the pastic part of the gearbox. Don't necessarily have to change it. You could retap to a slightly larger diameter or lock it with loctite. Unless you removeyour motors in & out all the time. Otherwise get a new gearbox from Losmandy.
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