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I have used the focusing collar on a C8 when I had one. Works on the mak as well as the dobs duel speed focuser. On my acro I had a similar idea. A small boss that slipped on to the rack and pinion shaft. It had a threaded hole into it that I screwed a longer stud into it. It swung free until I was close to focus. I then nipped it up and once again gently pushed forward or backward for best focus.
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