Originally Posted by sydney
I could also guess the retainer(L- plate) isn't positioned right either. I'd disconnect the cable,see if the derailer will move freely by hand, if so, then start checking for casing/caable issues all the way through the shifter.Check that shifter works with hand tension on cable.then double check that the cable mount and caable retainer at the rear D are correct.
Here it is. Also it looks like the thumb screw has been mashed a bit. Problem?