Ay folks have a problem running a Dura ace FD 7403 front derailer with campy cranks the ones with the different coloured lines around them.¨Record... Anywho when I shift to the big ring it touches the crank arm. Its a brazed on derailer and the frame has none so I had to get the clamp for it . I dont want to go bending and ruin it. Or could it just not be compatable. THANKS