I recall from somewhere, that the coppers use some sort of light ie, IR, Black, Fluorescent etc, or something that can actually "see" the indentations made by the original punching under the surface, even though there is nothing visible.
I'm sure someone here will know what I am on about.


 
						
					 
					
					 
				
				
				
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				 Originally Posted by sniegy
 Originally Posted by sniegy
					
 
						
					
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