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Thanks for the link Rob. Seems the problem is not new. I went back last night and had a further play after I read your thread from 2008. I saw that when the focuser worked normally, and after focus was achieved, if you tightened down the locking not it not only threw the focuser tube well out of alignment but also, and interestingly, it actually drew the tube inwards and hence out of focus again. How odd. There must be some spur on te end of the locking screw that acts like the tip of a flat screwdriver and pulls the tube forward.
But in terms of the answer, I have seen that putting a focusing motor with their inbuilt gearing, tends to hold a focuser in position pretty well, but then, a JMI or similar motor will set you back about A$250 anyway - money better spent on a focuser that won't flog around all over the place.
Peter
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