the bolt that holds the idler-pulley on gets bent from the tension of the belt pulling down on it. i replaced my pulley but not the bolt and it wobbles. i'm thinking that it will bend another bolt if i change it so i haven't unless i find one out of d-2 steel or something hardened. i have been dying to get rid a sqweek that i have and nothing i do helps. i thought it was the belt, idler-pulley, glazing, dirty pulleys, etc. i'm soooooooooo frustrated . i also can not create anymore tension. sorry to go off track but replacing the bolt should get rid of the wobble, for now.