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		 Be aware the weights in the article text are incorrect, supposedly the diagram is correct and uses larger weights. 
 
On the ones I built I used a full cup face from a large 1.25" Salty Ball rotary rasp.   If I did it again I'd make a much shallower cup.  The plugs are very heavy, @ 4oz as I recall.  I used birch which may have added weight. 
		
		
		
		
		
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