The black knob that that rotates to move the mirrors around inside the microscope is loose and I cannot get it to tighten using the set screw. I've unscrewed this screw so that it is loose and the knob spins freely but the knob won't come off. I've tired prising it off the shaft but this just snapped a portion of the plastic off
I have also managed to unseat the monofilament cord that runs around the pulleys. Any ideas on how to resit it?
Any ideas most welcome.
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