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We are interested in astronomy, and use a telescope in a backyard observatory to photograph nebulae and galaxies.
I needed a way to mount a focal-reducer lens inside an empty metal barrel, so I made this bushing and ring from Delrin®.
Here the bushing (but not the ring) is installed in the metal barrel. The glass lens slips inside the bushing and rests on the rim at the bottom. The ring rests on top of the lens to cushion it when a threaded metal retaining ring is screwed into the barrel.
Updated September 7, 2016