I love dimple dies, and the selection of them that exist now is crazy, but some of them are pretty pricey. The countersunk “finish washer” style dimple die that Karl makes in this video is one of those expensive pieces. They cost about $100 to buy just one or $300 plus for a set that has a handful of different sizes. Not cheap for sure, and something you can make at home to your own spec if you have a lathe. The material to make this is a few dollars and so if you started making some of your own tools with a lathe you could quickly pay for it.
This type of dimple die is not only for making fasteners fit flush and a finish washer looking dimple, but also will help to strengthen and straighten a panel that you have made out of sheet metal. It is especially helpful if you have bead rolled the panel and it has some wave to it.
Karl will explain.
On this episode of Make It Kustom, I make a dimple die punch tool to countersink tapered screws into sheet metal. This will also help flatten bead rolled panels by shrinking the ‘frame’ of a panel to relax the tension from bead rolling.