EE WAS REPLACING THE BACK, RIGHT FEEDER BOLT ON THE SYNTRON FEEDER. A COME-ALONG WAS BEING USED: ONE HOOK ATTACHED TO A CLEVIS ON THE FEEDER, THE OTHER HOOK ATTACHED TO THE FEEDER ROOF HANGER BOLT. EE WAS HAND-TIGHTENING THE FEEDER BOLT WHILE ANOTHER EE WAS LIFTING WITH THE COME-ALONG. THE FEEDER ROOF HANGER BOLT BROKE CAUSING THE SPRING CLUSTER TO FALL. HIS HAND WAS CAUGHT IN IT.