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					Originally Posted by  trick-kit
					 
				 
				 
Here you go, there are several ways to add flats for the spanner, the drawing shows a hexagon, this can be either end of the 25mm diameter section, or in the middle even. Or you could just machine 2 flats into 25mm bar.
 TK 
			
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 Or just buy hex bar to start with as the rest of the job is just turning.
Bob