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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?