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Note in addition to original post:
We had a few nights when the temperature remained near 30C and the double sided tape holding the primary in place softened enough to allow the mirror to slip slightly sideways and into contact with the backup edge supports. Bad astigmatism was the result, because I had not bothered to align the OTA to get the edge supports in the right orientation re vertical (not normally an issue). Will now remove the tape and use silicone adhesive instead.
added: yep, the acid cure silicone worked well. the scope now shows no sign of astigmatism and the mirror is well and truly locked in place - so well that I have removed the secondary edge supports altogether. Regards Ray
Last edited by Shiraz; 18-03-2012 at 09:00 PM.
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