I bought a steel replacement fork for my Klein Quantum and took it to my LBS for installation. The mechanic told me I'd guessed wrong on crown race size. The fork is 27mm, my headset 26.4. Welcome to my life. He said my options were to get a correctly sized fork or he could install a Velo-Orange Grand Cru headset. He said the headset is "notched" and can work with either size crown race. I bought the headset and had it installed with the fork. Today I took it for a first ride. The steering is fine, smooth and solid. It seems to me, though, that the front wheel does not hold center as well as it should. If I take my hands off the bar there is no center stability. It quickly dives to one side or the other. Is this possibly a result of not using the Velo-Orange headset as it was intended? Thank you for your thoughts.