EE REPORTED: HE & COWORKER WERE DISSASEMBLING BELT STRUCTURE FROM OLD NO. 3 BELT ENTRY. THE COWORKER HAD REMOVED HIS END. WHEN THE VICTIM WAS ATTEMPTING TO LOOSEN THE OTHER END. COWORKER DROPPED HIS END, STRUCTURE RAIL MOVED SUDDENLY CATCHING VICTIM'S FINGER TIP AGAINST BELT STRUCTURE STAND. EXTENT OF INJURY WAS SIMPLE FRACTURE TO TIP OF RIGHT RING FINGER