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I use the Baader microfocuser #2458125 on the spectroscope. I also have a Borg #4317.
They both suffer from the same problem. For a normal eyepiece they are OK; for a camera they're no good. Any offset weight distribution (ie DSLR etc) causes them to rotate and change focus!!!
The answer is to drill and tap a M4 thread in the body and use a M4 nylon screw as a friction stop.
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