There is a much easier way of making a steel jig that will do all wishbones and it uses less than 2mtrs of 25x25 and 500mm of 19x19. It's a basic rectangle made to the biggest wishbone that being the lower rear. Put your bush tubes in place on a flat surface and use the 19box as a straight clamp bar top and bottom. I use cheap G clamps as weld splatter tends to stick to the threads. As it's a backless jig you'll be able to turn the jig over and weld the other side with out unclamping it. For the top wish bones simply weld another tube lower down,clamp the bush tubes in place as before and tack the threaded tubes in place.
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