install wrong, damaged during install, or just a bad pulley....we won't know until there are more facts on the table...save the finger pointing until every thing is checked out. I have seen a lot of pulley installs and not all are pretty....but, that didn't sound like any of the wrong installs I have witnessed. I would think you could see lose rivets or a bad plate. Even the old Code 3's with the bad plate didn't sound like that... Good Luck Fu...hope it is something simple...