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It's as simple as a ring (collar) that fits around the outside of the tube and a different focuser fits directly over that. My design was more a cone type unit, I'll see if I can get a photo later.
There's focusers available with the standard 3 screw holes in the collar, it shouldn't be a big job.
Last edited by Leo.G; 08-02-2024 at 01:19 PM.
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