You need to patent this tool. It can be used in sheet metal shops all over the world. This is a must have tool for male radius fittings like OG offsets and elbows. Well done sir!!!
This tool exist in others designs, and it interest some specialized workers, patenting is difficult in my opinion for the technology, brianhw's tool is a very good concept in itself, selling it is another story, but as said it's just how I see it. ;-)
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