It's a BMC fork with an FSA headset. It was shced. 40 pvc. Looking at the headset it says tapered 1 1/8 to 1.5, so I'm thinking I may have need 1 1/2 pvc. I really don't understand why when it is spread out enough to completely seat on the fork why it is too large for the headset. Wondering if the fork needs milling.