Has anyone actually set up the Portacatena option for these rear Campy dropouts? In this system there are two small holes in the right rear dropout. One chucks the 6 speed cassette and puts on a 5 in its place. The extra cog is taken up with an aluminum Portacatena (chain carrier). This is basically a device which catches the chain on a tiny rail that is attached to the inside of the right rear dropout. There is a special right side Campy shift lever with a lockout. In a race situation one flips the lockout and shifts to the dummy Portacatena in the smallest cog position. The wheel can be easily removed and reinserted. The two small holes in the right rear dropout are easily missed for those that have them.
Garth Libre in Miami Fl USA