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Hello,
Re " ..but I didn't think that would dictate what I could put in the drawtube, as long as appropriate counterbalances were in place, and assuming no flexure of the structure..."
With the ultra light your talking 23kilo on the OTA, if you increase that by several kilo's it may be worthwhile seeing if the teflon pads can be swapped out easily for a slightly larger set.
That will help with the action a lot as well if its goes bung, Kriege's and Berry's friction formula from "The dobsonian telescope..." should be on the web somewhere.
Steve
if you add secondary heaters, cables the camera and the massive counter weights needed - you could go some serious added weight on the alt axis, not just weight forward of the balance point.
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