TM 10-3930-669-34 13-2.  MAST ASSEMBLY REPLACEMENT/REPAIR (CONT). (17) Install  two  shims  (50)  and  rollers  (49)  on  inner rail (48). (18) Install  two  anchors  (46)  on  inner  rail  (48)  with lock nuts (47). (19) Install  primary  chains  (32)  on  anchors  (46)  with two pins (45) and four cotter pins (44). 13-20

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