TM10-3930-660-20 18-19. MLRS  ATTACHMENT -  REPLACE  (Cont’d) Support rear of cylinder (13) with chain prior to installing MLRS attachment (11). Failure to do so may cause personal injury and damage to cylinder (13). b. Start engine and carefully move vehicle toward MLRS attachment (11). Stop engine when mounting holes are aligned. Stop engine. Spacer rings (28) are used  as required and may not be present on all vehicles. Install spacer rings (28) only if removed during removal. c. Secure attachment (11) to boom with two spacer rings  (28), pivot pin (27), capscrew (26) and new locknut  (25). Continue to support rear of cylinder (13) with chain until pivot pin (22) is installed. Failure to do so may cause personal injury and damage to cylinder (13). Adjust lifting device as required to take weight off of pivot pin (22) during installation. Apply anti-seize compound to pin (22) as installed. 2. INSTALL PIVOT PIN (22), CAPSCREW (24) AND NEW LOCKNUT  (23) TO SECURE  MLRS ATTACHMENT HOIST CYLINDER  (13) TO MLRS ATTACHMENT (11). 18-78