THE EE WAS REMOVING PIN GATES FROM A HOPPER. THE EE WAS USING A SLEDGE HAMMER TO KNOCK THE PIN GATES OUT. WHILE ATTEMPTING TO STRIKE THE END OF THE PIN THE HAMMER MISSED. THE WEIGHT OF THE HAMMER STRAINED THE EE'S RIGHT SHOULDER. THE EE REQUESTED & SAW THE DR. ON 11/24/03. THE EE'S JOB RESTRICTIONS BEGAN 11/24/03.