EE WAS BOLTING A HIGH SPOT ON #1 UNIT IN ENTRY 3-4 ON WED MORNING. THE GLUE AND BOLT SLID OUT OF THE HOLE AND HE CAUGHT THEM AS THEY FELL. THIS CAUSED HIM TO STRETCH BOTH ARMS OUT. HE STATED THAT HIS SHOULDER POPPED WHEN THIS HAPPENED BUT IT DIDN'T MATTER. HE RETURNED TO WORK FOR THURS SHIFT AND SHOULDER POPPED AND THIS TIME BECAME DISLOCATED.