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That 6 inch F/15 sounds interesting; Mine's only 1 inch longer focal length and 1 inch larger aperture so the builder could have some relevant tips on long focus newtonians. Do you know whose it was?
What was it like hand-tracking with a long focus scope on an alt-azimuth mount, obviously assuming it had no drive system?
Can you think of any modifications that could be done to the mount to improve its rigidity? When I got it it had an 8 inch F/7 newonian with it as well, which had a damaged mirror, but I gave it a quick test terrestrially and it seemed to be fairly stable, the magnification would have been about 120X. The focuser installed on it was 0.965 inch so I was using the eyepieces I got with it. I since discovered that it was screw-in and could be replaced with the 1.25 inch focuser so I could reassemble it and try it out at up to 466X, which is more than I reasonably expect a 7 inch to use.
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