Welcome to the forum, Heathley. 
Let us see if kowledged members have a name for that part. I agree that "sear" doesn't sound contemporary to such devices. I do read that the whole part is called either "match hammer" or, commonly, "serpentine". I wonder if there is a name for the section you show, i mean, in typologic terms. But i know next to nothing of these things. 
 
 
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						Last edited by fernando; 26th February 2020 at 01:22 PM.
					
					
				
			
		
		
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