Michael, 
Very interesting lock.  
I have not seen a sear/trigger that works quite like this one. very simple, but foolproof as well! 
If I ever "get 'round" to making a wheellock, this is something to try! 
(Been thinking about it forever, but something always gets in the way..) 
 
Thanks for posting the pics. 
 
Richard.
		 
		
		
		
		
		
		
		
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