EE OBSERVED AN OBSTRUCTION INT HE DISCHARGE OF A 3 INCH HELICAL SCREW FEEDER. WITHT HE SCREW ENERGIZED, HE REMOVED THE EXPANDED METAL GUARD AND PLACED HIS HAND INTO THE FEEDER TO REMOVE THE OB STRUCTION. BOLTS ON THE SCREW PULLED HIS HAND BENEATH THE SCREW CAUSING LACERATIONS AND 2 FRACTURES.