EE WAS USING A 12# DOUBLE JACK TO KNOCK OUT A BUSHING ON A 54D MUCKER. FELT A POP IN LEFT SHOULDED, FILLED OUT A NOTICE OF INJURY TO HIS SUPERVISOR, BUT DID NOT REQUEST MEDICAL AID. ON 7-6- EE SEEKED MEDICAL ADVICE ON SHOULDER AS IT WAS BOTHERING HIM. SURGERY ON SHOULDER WAS PERFORMED 11-30-00. EE HAD NO LOST WORKDAYS OR MODIFIED DUTY UNTIL SURGERY