>> C << Idler Pulley Installation
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Because of the shallow hexagon hole of the hexagon socket head bolt, firmly insert the tool and carefully work not to damage the hexagon hole.
Install the idler pulley using a hexagon wrench with 8 mm (0.31 inch) width across flats.