I found a product called "socket caps" @ Sears. Basically a square drive with a hex head. Designed to turn sockets with a wrench in tight areas. Used the 3/8 socket cap in the tensioner hole, the correct size wrench, and a piece of pipe over the wrench as a cheater bar. Worked great. There was no way I could get a breaker bar in there. The Craftsman socket caps, come in a set of three (1/4,3/8,1/2). Can't remember the price, but was worth it and may come in handy for other tight spaces.
