I doubled up some 18mm pl with PVA and clamped it for a few hours. I drew the shapes I wanted and bandsawed the external and internal profiles. I used a rasp to 'fit' the internal profile of each of the four half rings to their respective part of the tube, having marked each one first. I cut two 4"x10" stretchers and drilled them for threaded inserts and glued, pinned and screwed the rings to these. I drilled through holes in the tabs top and bottom for the bolts and t-nuts to clamp the tube. I've resined it all and it's now curing. I drilled four holes in each of the soil pipe end caps. There are three positions in the stretchers for the bearings to attach to, giving me 2 inches fore/aft to play with.
It's a rough job but it should hold the scope. I hope.
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