I have just returned to cycling after a 20 year break, to say I am a little confused with regards current component technology would be an understatement! I have bought a old gazelle road bike from the 1990s, I have also bought some components namely campag Centura front and rear hubs 9/10s 2006 versions, a campag record double chainset 10s 2006 version. I also purchased a Centura 10s cassette 2009 version 13 to 26t. When I put the cassette on the hub the locking ring was practically flush with the hub nut which I feel cannot be corrected. Would a 9s cassette be narrower? If I were to run a nine speed system could I still use my 10s chainset? Also I was thinking of using a indexed gear system presumably I would need 9s leavers if I was going with a 9s system. Failing that could I just use friction down tube leavers? Any advice would be greatly appreciated.