Yes Mark, biggest let down of the G11 (and G8) are the plastic threaded slots into the gearbox. So easy to strip. For something that is a precision instrument I don't understand why they haven't been changed years ago.
My suggestion ...... araldite down the screw holes and screw the motors back on and hope you don't have to separate them at some later stage. Or maybe even some Locktite
about the limit of my engineering skills I'm afraid
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