It sounds like you may have the same problem I discovered not long ago regarding Campy 9/10 speed hubs and lockrings. I don't remember all the details, but I beliieve the problem is that before about 1999, but after eight speed of course, there were nine speed compatible hubs that require lockrings that have a smaller diameter of the threaded part of the lockring than the newer ones. The newer lockrings are 27.0 mm diameter (threaded portion of the lockring) I believe. I remember doing some cussing that day, and I don't remember exactly how we solved the problem, but we did. I was simply trying to install a nine speed Campy cassette on an older Campy nine speed compatible wheel IIIRC. I do remember calling Brandford Bike and they gave me the pertinent info, I should have committed it to memory better. I suggest giving Branford Bike a call, they know their Campy stuff like no one else.
Last edited by well biked; 11-20-09 at 07:38 AM.