On the turbo this morning before work (why...?). Decided to give it some welly for 5 minutes, so pushed my left Campag paddle in to move to the big ring, but felt no difference. I looked down, and the outside plate had moved out, but the inner was where it was. The whole thing had sheared apart at the pivot. It was a 2 year old Centaur mech - is this unheard of? I've not come across it. I've ordered a shiny 2008 Chorus mech today, so not crying over it, but still a bit miffed - at least I wasn't 50 miles out!