The bolt for the belt tensioner pulley is right there in the middle next to the pulley. It sits happily in the middle of the dam engine. If you made it this far you probably scratching your head and asking yourself, "GERMAN ENGINEERING?" I have heard some people do it the easier way is to the take the A/C compressor off and get to it. The car must be lifted up in order to do that, but I didn't want to d/c the compressor and recharge it. I don't have a vacuum.