Originally Posted by unworthy1

OK, Thanks for the reply, but in this case the cassette/small cog is the same size and transfers between the 2 bodies with no hitch, so I'm a little confused. The old body is black finish and seems to have straight-sided slots or grooves for the cogs, the new one is silver (could even be alloy) and some of the slots are undercut, but the cogs still slide on anyway (thanks, Campy, for at least that much interchange). So...