I needed a forge. The heat would soften the steel and ready it for shaping. I had only a wimpy workshop blowtorch, which can barely melt solder. But if I could trap its heat in one place, the temperature would rise and rise. So I took an empty paint can, punched a hole in the bottom, and screwed in a conduit fitting to hold the blowtorch in place. Firebrick and rock wool (available in most large boiler rooms) insulated my forge extremely well, and in less than 10 minutes, the leaf spring glowed cherry-red.