TM 10-3930-669-34 WARNING • Primary  cylinder  assembly  weighs  80  lbs  (36  kg).    Attach  suitable  lifting  device  prior  to installation to prevent possible injury to personnel. • All personnel must stand clear during lifting operations.  A swinging or shifting load may cause   injury or death to personnel. (20) Install  primary  cylinder  (40)  on  mast  assembly (15). (21) Install  cylinder  retainer  (43)  on  primary  cylinder (40) with two lock washers (42) and screws (41). 13-21