A little jig (not of despair)
A rail-setting fixture to position the central rails of a rack at ~4" apart and, more importantly, at the right position on the platform instead of where my lying eyes tell me they should be (I have spent too much time on too many racks melting out one central rail or another because what looked good to my eyes at brazing time turned out to be WAYTHEEFFOUTOFALIGNMENT™ when looked at by the gimlet eye of a caliper.) I will still have to do some eyeballing of the tombstone placement, but this will work better when I’m looking at the tombstone against a pair of known good central rails + a pair of sharpie marks instead of just a pair of sharpie marks.