The old timer told me they did the mullering by cutting a 32 LPI line, then yet another one, and used the first one for a centering line for the round bottom cutter. It's what I've been doing for a while. I made a tool by silver soldering a single line cutter on each side of a round bottom cutter. It's not worth the effort and that tool is a bit tough to control. Cutting the 32 LPI lines is much easier and according to this fellow it's how Parker did it. I see evidence of it in some factory guns here and there. Jerry
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Threaded Mode