I finally finished the rebuild of my Pinarello with a mixture of Chorus and Record parts. The one thing that I brought the bike to the LBS for was the chain installation- I did not have a chain tool that would work on a Record Ultra-narrow chain. They put it on and I have now taken the bike on 2 shake-down rides (total of about 50 miles). It rode beautifully and needed some adjustment of the rear derailleur (not jumping to the biggest cog easily) and my impression is that it was significantly noisier than my old NR setup. I put the bike up on the stand to look at the rear- was it rubbing on the cage?- and was surprised to find that the LBS had threaded the chain on the outside of the little tab on the inside of the cage by the upper jockey pulley (see picture). Inspecting the cage shows that there is some scoring where the chain was rubbing. The chain looks ok, but (1) how can I tell if the chain has been damaged and (2) is the scoring and slight burring of the cage a potential problem?