CHARGING HOPPER FOR MAGNETITE BIN FEED SCREW HAD PLUGGED EE HAD REMOVED INSPECTION COVER SO AS TO WATCH FOR MATERIAL TO FEED. AFTER HOPPER HAD BEEN UNPLUGGED EE WAS USING DUCT TAPE TO COVER IN SPECTION HOLE WHILE SCREW WAS RUNNING HIS LEFT INDEX FINGER WAS CUT WHEN IT CAME IN.