John,
thanx for posting the picture of the 41T ring and comment. I read many months ago on this list that the 41T campy ring would cause the chain to grind into the chainwheel arms, leaving gouges. Perhaps the TA 41T ring is "out of round" because they modified the curvature to fix this problem ?? Those french are soooo tricky ...
- Don (je m'appele) Gillies San Diego, CA USA
P.S. Super record calipers have aluminum holders, I believe.