I got tired of the chain cleaning hassle with a mounted chain so I added a KMC link to one of my Campy 10 speed chains. Most of my bikes already have them. The installation went well and soon I had a clean chain and cassette. Reinstalled the chain and shifted through the gears on the stand with no problems. Later that day went out for a 50 mile ride with friends with no shifting problems, however, the chain sounded loud. After I got home, it dawned on me that I must have installed the chain upside down creating a situation where the worn cassette meshed with a new chain. Bad!!

A quick switch rectified the problem. I'll be more careful next time. Direction of travel and orientation are important.