THE INJURED EE WAS ASSISTING A CO-WORKER IN TRYING TO LOOSEN A TIGHT BOLT ON A 4248 JAW CRUSHER. THEY WERE USING A LONG PUNCH & A HAMMER TO TRY TO DRIVE THE BOLT OUT. THE EE'S HAND SLIPPED JUST AS THE OTHER EE SWUNG THE HAMMER TO HIT THE PUNCH. THE HAMMER STRUCK THE EE'S RT.RING FINGER.