EE WAS REMOVING TEETH FROM TRACKHOE BUCKET. HE PLACED A 3/4"" NUT IN PIN SLOT TO KNOCK PIN LOOSEWHEN HE STRUCK THE NUT IT SHOT BACK & HIT HIS LEFT HAND CUTTING & BRUISING IT. HE WENT TO DOCTOR & WAS TOLD WHILE IT WAS NOT BROKEN TO KEEP IT ELEVATED FOR A FEW DAYS. HE RETURNED TO WORK ON RESTRICTED DUTY & WILL SEE DOCTOR ON 1/5/01.