I have a phaser 850 with a broken piece that fell out of the printer when I opened the main paper tray. It is a silver bar with four gray rollers attached. It appears to fit on the front of the printer near or on the pick guide assembly. Both sides of the silver bar have a keyed tab, but one is wider than the other. It appears I can slide this mechanism back into place, but I'm not sure of that. Any help appreciated.