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Old 5th February 2025, 05:35 PM   #13
A. G. Maisey
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Join Date: May 2006
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By a radius, I mean a curve, a part of a circle.

So, using a grinder you grind a curve into the small end, not the tang end, of a three sided file, a 6"-8" file is about the right size.

The curve runs from one of the sides to the opposite edge.
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