Shimano Dura-Ace 1st Generation Brake adjustment I am trying to get my rear brakes to work properly but I do not understand how it works.

I dissembled the caliper, cleaned each component (since the brake raked (?)). But now I have the problem that the side where the brake cable attaches is stiff and only the other side moves properly. I can provide two pictures of how I reassembled the brake



From another perspective:



On that second picture only the right side of the brake moves the other one does not when I pull the lever. Anyone who can help me?
Your spring is not right - its one or more of


bent unevenly
lost springiness with age
pinched 
mounted not square in the retainer.


I've tried to show the difference I see here:



To be honest unless originality is a big thing, consider moving to a dual pivot brake caliper.  The old single pivot side pull caliper was always sub par.