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Roger replied and isn't put off by tackling a Tele Vue scope so I may pay him a visit.
I also discovered tonight that the retaining ring on the front of the lens was a bit loose. Tightening this by hand (and breaking several nails in the process) has made a dramatic improvement and the coma seems to be gone. It's not quite perfect but then the seeing is awful so it's hard to tell. Once I get a better night I'll do a proper star test but things are looking up.
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