Dumb things that you did.......because you didn't know any better.

I tried to drill out the back of a crankshaft to accept a 4 speed. .

Got into a discussion years ago with a friend about drills. He was bragging about some "unstoppable" old drill motor. I asked him, "why on earth would you WANT a drill THAT YOU CAN NOT STOP? At NAS Miramar, we inexplicably had an old Black and Decker 5/8" drill mounted in a drill press fixture. Turned real slow and took 5 minutes to stop. Later years, working in the big parts/ industrial store in town, some weird guy ordered one of those new