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I have drilled one of these out for a friend faced with the same dilemma. There is plenty of metal in the solid section of the coupling to do this without affecting it’s integrity.
It is quite straightforward with the right tools. I did the hole widening with my lathe. But it would also be quite straightforward using a drill press.
I would not try to reduce the diameter of the focuser pinion. It is doable on a lathe, but it will detract from the integrity of your scope.
Do you know someone locally with the right tools? A local machinist could widen the hole in a “jiffy” - perhaps a six pack as a thank you.
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