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BTW- For my next 22'' scope I will have a center pivot point on the Az. from the beginning to save time. The Alt will have the same double tangent arm as it is a easy, collapsible solution for horseshoe-shaped bearings that works.
The main reason the 16" Tridob had no pivot point on the Az to start with is that it reversed the normal design of having a rigid mirror box and flexible ground ring, having instead a rigid ground ring and a tiny square flex-rocker. Also, the scope swings through the center of the ring a bit to lower the eyepiece height.
Its a great design that works well (and collapses into a small package) when finished, but the 22" will be simpler and less time consuming to actually construct.......
I hope.
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