What the hells wrong with the tensioner?. It was 50 bucks from my LBS and it did the job freaking perfectly. Bambi.. sorry I didnt get back to your PM.. what you do is.. take the chain apart so its in one line.. bolt the tensioner onto the deraileur hanger.. feed the chain through the jockey wheel.. When I used it the jockey wheel sat ONTOP of the chain so it was pushing it down. Now adjust teh jockey wheel in/out so The chain isnt hitting the little metal bit and runs smoothly with not much sound. Screw it in tight so It doesent move. Put the chain back 2gether and it should be sweet mind you, you might have to take out a Link or something to get the best tension.
Cheers.