Old soldering iron that belonged to my grandpa. Doesn’t work anymore, so I’m going to try disassembling it (failing that, cutting it) and making the handle into a unique wooden shift knob. Should be a rewarding evening project.

EDIT: as a side note, this is a particularly appropriate use of this handle since my grandpa utterly loved Miatas and small European sports cars, having owned an MGB, a Kharmann-Ghia, and a few others that slip my mind.