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I have an early one of these with the stock focusser. It was OK but would slip with a heavy camera or spectrograph on it.
I pulled it apart and drilled 2 holes in the base at about 60deg. I then tapped these and inserted locking bolts. It now can be held absolutely rigidly with any weight you want on it for the princely sum of about 50cents worth of stainless bolts.
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