When you put on your new tensioner derailleur, post a picture. That is something that i need to do, but not sure how or where to mount the thing.
Got the idea for another forum. Did a search for "Idler pulley" or something and got a hit in the MTB forum I think about some guy who out an old derailer in place of a idler pulley on his MTB. Mine is now quite now, I'm in no hurry to change it. My next quest is regarding putting a 140mm hub into a 135mm aluminiuminum drop out on our tandem. I can't cold set it, but will just stretching it 5mm cause problems?