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I've also basically finished the upper end of the scope so here it is.
#1 Made out of 25X25X1.6mm aluminium angle, it's 340mm wide on the outside and 290mm wide on the inside. I simply cut one side of it, drew some lines on the table so I knew where to stop and bent it by hand. It took a lot of maths to work out the length of each side but they're meant to be 128mm each. #2 The secondary holder is fully adjustable, similar to Gary Seronik's design.
The truss connectors for the top are glued on four sides and I made them by heating and then gluing two pieces of plastic together. They're simply holes drilled at a 7˚ angle into the plastic and tension (not sure where from) holds them in.
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