TM  10-3930-669-20 (6)   Install   nut   (11)   and   dust   cover   (10)   on   wiper assembly (9). WARNING Use  care  when  installing  wiper  arm. Wiper  arm  is  under  spring  tension and    can    act    as    projectile    when released and could cause severe eye injury. (7)   Install  wiper  arm  (8)  on  wiper  assembly  (9)  with lock washer (7), nut (6), washer (5), and nut (4). (8)   Install  stoplight  assembly  (2)  on  bracket  (3)  with four screws (1). NOTE Follow-on Maintenance: • Connect batteries (Para 7-48). • Remove wheel chocks (TM 10-3930-669-10). END OF TASK 16-11