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I made the T45 wishbone on Brommers bike #4 myself using some 1/2" T45 tubing from Proformance Metals and a cheapo 1/2" pipe bender from eBay. The top section of the wishbone was a random chainstay from Geoff Robert's stocks, flattened to 1/2" depth in a vice to give enough width for the mounting of the dynamo rear light. Brommers bike #5 won't have dynamo lighting, so I'll just use an offcut of the 1/2" T45 tubing for the upper part of the wishbone.
awesome thread! do you know where the t45 wishbones come from? I'd love to build a frame with one