fine focuser knob for R&P GSO/ZHUMELL
thingiverse
A top-notch fine focus knob fits perfectly into the rack and pinion GSO focuser system. A small screw is needed to secure the original knob in place. P.S.: The pictures show a rack and pinion GSO adapter mounted on a 6-inch Skywatcher telescope, and I'm hoping that the Skywatcher's knobs share the same diameter.
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