Chorus rear mech Jamming

in Workshop
Just wondering if you have any ideas what could be causing this.
https://www.youtube.com/watch?v=DdO-spTk9Yw
I was unable to get the gears working, I have removed the cable and you can feel it jamming.
Off the bike you can feel two very tight spots on the parallelogram when pushing the Arm in

I was unable to get the gears working, I have removed the cable and you can feel it jamming.
Off the bike you can feel two very tight spots on the parallelogram when pushing the Arm in
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that sometimes happens when youve left your bike after a salty winter ride, lube and lots of moving helps but there it looks like something may be bent or corroded. though as someone else has said it looks superficially like its in good condition.
Its been years since i had hold of any campag, take it apart and find out whats wrong. Malcolm on here does campag i think. It always used to be the case that campag was very good for spares.
Is that not the main attachment screw/pivot? May have been over tightened?
Just guessing.
I am not sure. You have no chance.
It should pivot smoothly with only the spring for resistance. Something is wrong.
I am not sure. You have no chance.