Thanks guys. I was thinking the same thing DaveSSS. Campy 10 speed is 5.9mm wide 11 speed is 5.4mm I think. What's 0.5mm between friends. **********? What is amusing is the total lack of interest Bike shops have in quick links. I guess they have to use their super expensive Campag chain fitting tools for something? I have used various brands of links for years on all sorts of chains without a single failure. The Connex link cannot possible come undone due to its unique design. I will take your advise and give a KMC "missing link"a crack with my new 11 speed groupo.