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Then tightened down the pulley. As a side note, we moved the idler pulley slightly outboard on its bearing so the belt would be better centered on the idler. Scion does not really control this tolerance so some cars need to have this done if the belt is riding on the edge of the idler pulley. It is just a simple matter of putting the pulley on the bench and tapping it on the outer side of the bearing to move the pulley surface in relation to the bearing.