I too have this problem. I recently purchased some Vuelta Corsa Lites for my 1985 Ciocc steel frame bike and found the rear wheel would go into the(Campy) dropout, but it is very tight. I know I probably shouldn't have done this, but I very gently used my Dremel tool to file it down some. The thing that worries me is my old rear wheel seems a little loose in the dropout now? There must be a diameter difference between the two (axles).