I have 2 or 3 holes that need to be dimpled right near an edge. I need to grind down the edge of my female #6 screw dimple due. I don't feel like destroying it for just those few holes. I have a lathe and I could make a female die that would be good enough if I knew the correct dimensions. I expect they are not exactly 100deg because of spring back and there are likely other subtleties that I don't know about. Google did not turn up anything. Anybody have any info?