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			the assembly is surely brass.  can you not simply replace the entire tuning mech section?  they sell them for acoustic guitars....gear and all.  oh. and my next door neighbor has a machine shop in paoili, but he's a nutter.
		 
				__________________Whether I shall turn out to be the hero of my own life, or whether that station will be held by anybody else, these pages must show ...
 -C.Dickens
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