The problem is not with the Campy. shifter, it is with your crankset. If your Campy crankset is a 52-42-30 , the FD-6603 (made for 52-39-30) won't work, the back lip/flange of the dérailleur won't clear the 42T, and if you re-adjut it to clear the 42T, it will be to high for the 52T. Obviously, no problem if your Campy crankset is 52-39-30.