EE WAS ASSISTING A REPAIRMAN IN REMOVING A HINGE PIN BUSHING. HE CAUGHT HIS LEFT THUMB WITH THE SLIDE HAMMER WHILE TRYING TO KEEP THE SLIDE HAMMER CENTERED FOR THE REPAIRMAN. THE INCIDENT CAUS ED A LACERATION TO THE LEFT THUMB THAT REQUIRED SUTURES. HE DID NOT MISS ANY TIME AWAY FROM WORK (HE IS WORKING WITH SUTURES).