TM  10-3930-669-20 16-6.    TOP WINDSHIELD WIPER ARM REPLACEMENT (CONT). (2)   Remove  lock  nut  (4),  screw  (5),  and  blade  (6) from bracket (7).  Discard lock nut. (3)   Remove nut (8), lock washer (9), bracket (7), and screw (10) from arm (11).  Discard lock washer. b.  Installation. (1)   Install  bracket  (7)  on  arm  (11)  with  screw  (10), lock washer (9), and nut (8). (2)   Install blade (6) on bracket (7) with screw (5) and lock nut (4). (3)   Install wiper arm assembly (2) on drive shaft (3) with nut (1). NOTE Follow-on Maintenance: • Remove wheel chocks (TM 10-3930-669-10). END OF TASK 16-18