TM 10-3930-669-34 (12) Remove inner rail (48) from mast assembly (15). (13) Remove two rollers (51) and shims (52) from inner rail (48). (14) Remove four cotter pins (53), two pins (54), and two secondary chains (55) from two anchors (56).  Discard cotter pins. (15) Remove two lock nuts (57) and anchors (56) from center rail (58).  Discard lock nuts. (16) Remove two screws (59) and lock washers (60) from outer rail (61).  Discard lock washers. 13-11