Thanks to all. Craig I now have what you are describing fixed in my head. Appreciate the clarification. Do you have a photo? That would be useful.
Brian, thanks. I will add a comment to Potterfield YT channel on this error. Save me the time and expense of making a flat bottom cutter and messing up my Parker. Really appreciate it as drill rod is cheap, 01 Swiss checkering file is decidedly not.
So, what did the Parker Bros use to create the flat top checkering ? A 60 degree single line cutter?
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