Dont forget you can make your own sizes by using Marchisio sprockets and their adapters for campag or shimano
I get mine from Highpath Engineering.
Campag dont seem to think that you need an 18 T sprocket !!!!
Thank you very much for your post, very useful indeed.
Have just been to the Highpath Engineering site and it is just the type of thing I have been looking for (if a little expensive, but I guess they do not shift loads of them...)! Also has the option for spacing an 8 speed on a 9 speed Campag hub. The Campag spacing Kit-01 to do this has been difficult to find recently too.
Thanks very much!