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		 Nice tutorial, thank you for sharing.  I use a similar method to cut the "bowl" on the head.  I use a box cutter router bit.  It is 1" dia.  Does a good job, but you must make a jig to hold it steady in the drill press.  The router bit is just a big round bit with a 1/2 ' shaft.  Best used with the highest speed setting on the drill press. 
		
		
		
		
		
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