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		 An issue with 6X's is that they often break if you try to cut and bend them.  This means using a split ring and the combination of a split ring and heavier hook seems like a lot of extra ballast for thin swimmers. 
I have used them on large regular Musso surface swimmers and they do fine.  They also seem OK with bottle plugs.   Medium Pichney/BM sized swimmers do OK with them, but I've not had luck with the skinny musso style I use predominantly.  I think your idea of widening the plug a little is a sound one. 
		
		
		
		
		
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