I have the old mini planishing hammer. They don't sell it anymore, but I paid $40 for it on sale. It's pretty simple. Just a frame, 2 manderals ( flat and rounded ) and an air hammer with a special bit that is just flat. For $40, it's worth what I paid. I'v made some panels, but what I have used it most for is straightening flanges. I don't have a brake, so bending with pliers and running it thru the planeshing hammer straightens it up quick.. Only thing that doesent work right is the foot pedal leaks air, so it does not shut off, and only shuts down.