I was replacing my alternator today (again...) and as I was putting the belt on the grooved part of the tensioner (looks like the same material as the belt) slipped off and I can't for the life of me find it. So, does it absolutely have to be there and if so, where can I find a new one? I need an answer fast otherwise I probably won't make it to S.O.P. Just my luck too. I'll get a picture if no one knows what I'm talking about.
Thanks.