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An exploded view of how the mechanism fits together and functions would be a good place to start:
It would appear to me that the sight operates on spring tension on one side of the tab....while the screw adjusts it by moving in or out of the threaded hole on the other side...
My GUESS is....that the spring is jammed somehow and needs to either be replaced or freed-up in its recess. Either way, it looks like a simple fix.
It would appear to me that the sight operates on spring tension on one side of the tab....while the screw adjusts it by moving in or out of the threaded hole on the other side...

My GUESS is....that the spring is jammed somehow and needs to either be replaced or freed-up in its recess. Either way, it looks like a simple fix.