More precision engineering
Okay, so this time it might actually count as precision engineering, because I actually designed it and went to the hardware store to get the structural materials instead of scrounging through the basement for parts.
This is, obviously, a jig for brazing the legs onto a front rack. It doesn’t have enough reach to go down to the dropouts on a fork that doesn’t have rack brazeons (but in that case it doesn’t matter because by the time you get down to the dropouts they’ll be all over the place and it will need to be custom-fitted onto the bicycle) but it will reach lowrider mountpoints, riv/rawland rack mounts, and everything in between.
I should be able to just clamp a rack to it, lay the fork leg struts down against the rack, and then braze them together with only a minimal restraining bar to keep them from being knocked out of the way by the force of the torch flame.
I still need to mount a protractor, plus mark it for the location of various rack mount brazeon locations, but it’s workable now and after I braze up a couple of racks with it I’m sure I’ll think of other things I need or did wrong.