EMPLOYEE WAS SETTING 48"" TROUGHING IDLER UPON CATWALK TO BE PUT ON AFTER SETTING IDLERS DOWN. EMPLOYEE UNHOOKED CHAIN FROM IDLERS ONE OF THE IDLERS STARTED TO FALL OFF THE CATWALK. EMPLOYEE RE ACHED FOR IDLER TO PREVENT IT FROM FALLING. HIS MIDDLE FINGER WAS CAUGHT BETWEEN IDLER AND CATWALK HANDRAIL. EMPLOYEE WAS TAKEN TO DOCTOR. EMPLOYEE RECEIVED STITCHES IN MIDDLE FINGER.