FWB Stuck elevation knob FWB 65

oh, let me be the first to tell you, you have created yourself a problem
now when i rebuilt my FWB 90 the hardest part was putting the sight back on and i would say you will have to take yours off
but you are in luck i have a spare rear sight just in my stuff and here is what the rear looks like
now we have to guess what you did but my guess would be you have the clip jammed in some way
now with all guesses i could be wrong about what happen but not about that sight is coming off
i have never heard this happening before
https://www.feinwerkbau.de/en/service/downloads/technical-information/exploded-drawings

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so, PLIERS AND FWB 65 should not be in the same sentence full stop
now you can force anything you want to but if you screw up anything the parts will not be cheap
so the elevation screw presses again part 1600.006.1 it is called a leaf spring
now remember i said is was hard to reinstall the rear sight but it come off easily
start the video at 20:20 for the sight
do what you want
now question why were you doing what you were doing and is this pistol new to you and what front sight are you using and or installed
https://www.google.com/search?q=fwb...ate=ive&vld=cid:a787ccf8,vid:eUhXC7IEWY8,st:0