TM 10-3930-664-24 D.  INSTALLATION 1. Slide fork bars (8) through holes in sides of carriage weldment (2).  Feed bars through forks  (9)  and  into weldment mounts. 2. Install screws (4) and new locknuts (7) to secure fork bars (8) to carriage weldment (2). 3. Install  carriage  backrest  (1)  onto  carriage  weldment (2)  and  secure  using  screws  (3),  lockwashers  (4), and washers (5). FOLLOW-ON MAINTENANCE: None END OF TASK 2-420