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				snail screw
			 
			 
			
		
		
		
			
			Most of all T/C sidelock percussion have a hooked breech. 
CVa some models have a snail, it's the part where the nipple goes into, some of the older model looking from the side looks 
like a snail, inline with the touch hole on the "snail" is a screw, for cleanout purposes, I guess. I never did fool with that screw, I just took the barrel off, and good old hot soapy water to clean, shot of Wd 40, to displace moisture and dry patches, and 3 caps fired on unloaded gun after cleaning always worked for me.
		 
		
		
		
		
		
		
		
		
	
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