The rear upright jig is very simple to make. You need a flat bit of board , 8 screws , 4 bits of timber with the ends cut square and 2 bits of M12 stud about 200mm long. Drill 12mm holes in the timber at the right height and screw to the board to get the spacing correct. Assemble the upright kit tack it together then fully weld the back of it while it's still in the jig. I use the same jig made in steel and it's so much easier than the book jig to make.
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