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					Originally Posted by A. G. Maisey  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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 Sorry, still trying to visualize this. Is the radius to blunt the point in order to widen the scraping surface to avoid gouging?