Mark, that little hack could have saved me quite a few hours with a 3 corner file over the last 60 years.
Agree. That's genius, although that metric die won't work on a Stovebolt.
I've split a nut in two to use as a crimp tool for large gauge wire terminal. Stick the two halves around the ferrule and crunch it in a vice.
Here's the results. (The tool was disposable.)
