EMPLOYEE & A CO-WORKER WERE ATEMPTING TO INSTALL A SHIELD COVERING A SCRUBBER MOTOR ON A C/M. A BOLT FELL BEHIND THE SHIELD & VICTIM TRIED TO RETRIEVE IT WHILE AT THE SAME TIME HIS CO-WORKER PUSHED DOWN ON THE SHIELD & IT FELL ON VICTIM'S RIGHT INDEX & MIDDLE FINGERS. (NOTE: THE SAFETY DEPT. WAS NOT INFORMED UNTIL 2/27/02 THAT HIS INDEX FINGER HAD BEEN BROKEN).