An old machinist at a shop in Pittsburgh taught me a trick about blueprints I still use
I was in Pittsburgh for a job last spring and stopped at this tiny machine shop to ask about a weird tolerance on a print. Old guy named Joe, must have been 70, looked at it for 2 seconds and said "that's just a drafting error, kid, measure from the corner instead." He walked me over to his ancient drafting table and showed me how to rescale the whole thing by hand using a pair of dividers. I had been staring at that print for an hour and he solved it in 5 minutes flat. Has anyone else run into someone who just made drafting click for you in a weird way?