Actually I think that the screw behind the hanger keeps the RD from pivoting too far backwards; my problem seems to be that it isn't swinging back as far as the stop on that screw. Making me suspect that the spring where the RD attached to the frame is weak as that spring pushes the RD backward. Has anyone had experience replacing this spring, and/or know where to find one (Campy Chorus 8 speed)? I wonder of you have to not just put in the spring, but also wind it up some how to get tension on it?