#1A rear sight question

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tss106

Single-Sixer
Joined
Oct 20, 2006
Messages
135
Location
Texas
Hello gents, picked up a used (but fairly new) 1A that the previous owner removed the sights for some reason. I have the parts. Looks like the rear sight just needs to be tapped back into the quarter rib dovetail. What is the purpose of the slotted screw immediately forward of the rear sight dovetail? Previous owner loosened it, there's a collar/sleeve that the screw sits in and it has also rotated. Looks like that collar/sleeve has a "flat" that needs to align with the dovetail edge? Is there a proper way of reinstalling that rear sight with that screw/collar being loosened?
 
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