Filing buttons are one of those old tools that are still of value today. They let you shape stock into a nice looking radius by hand. One problem with these buttons is that they need a hole in the stock to secure them.
Recently I wanted to form a round corner on sheet metal and not have that mounting hole. I also didn't have a filing button of the right size. Using an old steel washer and a little heat glue plus a torch, the problem was solved.
If you are interested, please see
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