I have a 12-speed (Shimano 105) Di2 Rear Derailleur which is has some slop and can be slightly moved by hand. This slop is enough to affect the quality of shifting and will cause the chain to rub on the next/previous gear depending on whether the position is too far in/out and whether I'm shifting up or down and occurs in the middle of the cassette (since at the ends you hit the limit screws). This is not slop in the hanger, but in the parallelogram/linkage itself. I understand that some slop is expected, but I would expect this to be a bit less sticky. Is there anything I can do to fix this?
by alpharhinonxt