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Old April 29, 2016   #40
Worth1's Avatar
Join Date: Feb 2006
Location: Bastrop Texas Lost Pines Forest.
Posts: 35,280

I took the time to draw up more or less what the thread forming tool would look like to make the adapter.

This is the top view but there are some more angles involved in grinding these cutting tools.
They can be and have been done by hand for many years.


Cutting tool.jpg
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