Check to see what order the lock retainer and retainer with the bent tang are on. I had 2 of my EDS OX derailleurs assembled with the "B" screw tang assembled below the retaining ring and they both bound up when I would tighten them. Swapped them to what is shown in the attached image and they swivel on the hanger when tight.
thanks, but unfortunately my EDS OX 2.0 is completely different and it doesn't have the same assembly.
