Shrinking disc. No tool noisier than these, but they do work.

Tool I waited too long to learn was lead work. I'm not fast at it as I hardly use it, but I can do it, which is kinda cool to say. Most are scared of it, or they like bondo too much and will use those magic in a can high strength body fillers with aluminum powder or whatever mixed in and hope it holds up like real lead does.