EMPLOYEE HAD STEPPED UP ON THE PUMP PEDASTAL TO UNHOOK THE CHAIN THAT WAS USED TO SET A NEW MOTOR IN PLACE. HE WAS HOLDING ON WITH HIS LEFT HANDAND USED HIS RIGHT HAND TO UNHOOK THE CHAIN AND PULL TOWARDS HIM. WHEN THE CHAIN HOOK PASSED OVER THE CHERRY PICKER BLOCK HOOK, IT FLIPPED TOWARDS THE EMPLOYEE HITTING AND CHIPPING HIS LEFT FRONT TOOTH.