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Hi Ray. Thanks. In fact, the rings are 303mm (not 330mm). The diameter of my scope is 280mm, so unless the rings can be adjusted (?), I don't think these rings would fit. My Astroshop sell S-W 285mm rings for $79. These would probably be ok.
I was hoping I could mount the rings either side of the main tube's bearing brackets attaching the tube to the mount, but there is not enough room between the bracket and the end of the tube to allow a ring (see picture). I suppose that this means that the brackets would have to go.
Also because of the truss attachments that protrude by 60mm along the upper part of the main tube, I would have to fit the rings below the truss attachments, which would mean I couldn't fit the rings equally around the C of G axis, but below it. That would be a problem, wouldn't it?
Cheers,
Eric
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