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Raymo/Pete,
Having just taken responsibility for an ASV loan scope, a Bintel 8" Dob, it has a RACI finder scope and the mechanism for focusing the finder is exactly the same as you described. Hold the objective, slacken off the knurled ring, then rotate the objective to focus and tighten the knurled ring to secure focus.
Mozzies, thanks for the tips Suzy, I was out using the dob for the past 3hrs and the coil I lit, plus the Bug off wasn't working 100%, I'll try a box fan.
Reasonably good viewing in Melb tonight, managed to wait long enough for Eta carina neb and its nearby cluster and NGC open cluster to be visible from my deck... breathtaking some of these objects!
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