Originally Posted by
repechage
I did not read or catch that the frame derailleur hangar was checked for alignment with a tool such as to set up index shifting.
I would start there if applicable.
I am also assuming the wheel is the correct measure for the hub.
no excess slop in the mounting pivot.
these mechanisms are pretty stout, possible the parellogram is tweaked, not easy to do other than stuffing the cage into the spokes.
I was given a Nuovo Record mech 40 years ago, was performing poorly, had a twist, variable effect on performance, really depended on the cage orientation. had or made the tools, it was slightly twisted. risky to correct but what to lose? Time in the shop, a mill and a lathe, leverage.
Yep the drop outs were checked - by a very good frame builder.
I built the wheels - they do fit
Also rebuilt the RDs - no slop I believe.
I'm mostly trying to understand which bit is bent - can't see anything obvious with the cage so it might be the parallelogram somehow.
But I've now discovered that the bad RD is off by 3 degrees which isn't much and possibly is not something you would see just by looking at the RD.