I need to move my rear sight in the dovetail. This is on a 5.5" barrel from the late 70's early 80's vintage (pre Kreg version).

I see one set screw. Is there anything else holding the sight in place? I loosened the screw and attempted to move the sight with a few light raps with a soft tool. No movement. Did not want to go any further without confirming how this was affixed without getting more information.

Thanks for your advice.