THE INJURED WAS LOCATED IN THE #3 ENTRY AT THE FEEDER ON THE #1 SECTION. HE WAS TURNING A BOLT ON A SPEED REDUCER WITH A 3/4"" RATCHET DRIVE, A 1 7/8"" SOCKET AND 10"" EXTENSION. THE SOCKET CAME LOOSE CAUSING A MUSCLE STRAIN IN THE BOTTOM RIGHT SIDE OF HIS BACK. WE WERE NOT NOTIFIED UNTIL 8/28/01. THIS IS A DEGREE 3 CLASS 10 ACCIDENT.