Does anybody know what that bottom big pulley is on the GA16 and what it means if it moves, maybe it's just my eyes but I have a high pitched pulsating squeel whenever I turn on the car, and it's not the belt connected to the tensioner at the top nor is it the tensioner but I could've sworn the bottom pulley was bobbing so to speak in and out, im guess that's bad, it only looks to be 1/16th or 1/8 an inch sway, any suggestions, comments, solutions, help!