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					Originally Posted by fernando
					
				 Sorry for the impertinence but, those holes in the socket ... 
Double ? 
On the edge side ? 
So perfect ? 
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 Maybe to put in a stopper? Like on boar spear ("Saufeder" = "sow feather" in german, i have a huge example in my collection). 
http://en.wikipedia.org/wiki/Boar_spear