Hi

Yeah I didn't buy it new, it came with a random assortment of Campy stuff, so I'm in the dark as to actual instructions!

The BB shell is 68mm, so should I just fit it with one of the spacers and check chainline, and if it all looks good then proceed? My normal test for 'centredness' is the distance between the pedal-end of the crank arms and the chain-stays. If it's within 1mm or less then good to go.