Celestron/Skywatcher 40mm focus knob adapter

Celestron/Skywatcher 40mm focus knob adapter

thingiverse

Designed to allow more precise focus control to the standard 20mm rubber focus knob This 40mm diameter adapter leaves just enough clearance between the adapter and the lens aperture. Also fits the Sky-Watcher Skymax-127 Mak. Its an interference fit so push onto the rubber knob slowly and carefully. Diameter can be resized, as long as you maintain the 20mm central hole

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