EE STATED THAT HE STEPPED ON A ROUND BOLT LAYING ON THE FLOOR OF THE SHOP BUILDING. HIS LEFT FOOT SLIPPED ON THE BOLT AS IT ROLLED CAUSING HIM TO FALL. HE CAUGHT HIMSELF WITH HIS HANDS. HOWEVE R, AS HE DID, THIS CAUSED HIM TO TWIST HIS BACK RESULTING IN LOWER BACK PAIN, DID NOT GO TO DR. UNTIL 9-20-00 WHICH RESULTED IN LOST WORK DAY AND RESTRICTED WORK.