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Old July 14, 2012, 09:38 PM   #3
James K
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Join Date: March 17, 1999
Posts: 19,656
It is called, for obvious reasons, the "thumbnail". S&W once put them in also for the same purpose, which is as driver says. Then it was found that flame cutting went only so far and stopped and would never cut enough to be dangerous, so they stopped it.

Jim
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