OPERATING A ROOF BOLTER INSTALLING BOLTS IN A FACE AREA, WHILE PUSHING AN 8' ROOF BOLT INTO THE DRILLED HOLE, THE BOLT HUNG AND BENT. EE HAD GRIPPED THE BOLT WITH LEFT HAND, ATTEMPTING TO GUIDE IT INTO THE HOLE, EE MISTAKENLY ENGAGED THE ROTATION LEVER RATHER THAN THE MASK LOWER LEVER, THE BOLT SPUN STRIKING LEFT FOREARM RESULTING IN A HAIRLINE FRACTURE TO THE HUMORUS BONE.