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Geoff,
Well there goes my theory about the same sized secondaries. I think you are right in that GS are allowing for less than premium secondaries to be used by oversizing them. The one I installed was a premium Discovery one and is great but I would advise noone to go below the diameter that is calculated by NEWT so they don't get noticable drop off in their larger eyepieces.
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Matt,
I used some velcro circles between the backplate and the primary cell to hold it in place while I tightened the studs and, of course, they act as a kind of vibration dampner but, how much, I don't know as I have the studs done up as tight as my fingers can do them. Maybe I just lucked in on a smooooooth fan.
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