Dean,  Yes that allen screw has been replaced with a proper screw on the lifter button.  I am still waiting on a few things to get this one back together, but it is much better than it is in my initial post. 
 
On these early guns it seems there is always a hammer missing or there is a poorly made replacement hammer.  I guess it is just a result of these back action Parkers being 150+ years old and being used a lot.
		 
		
		
		
		
		
		
		
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