TM 10-6640-239-13 4-137 p. Remove six screws (47), lockwashers (48), washers (49), and top plate (50).  Discard lockwashers. q. Remove four screws (51), lockwashers (52), washers (53), and center keeper (54).  Discard lockwashers.  Repeat step for bottom keeper. INSTALL Install Gas Cylinder Rack.  See Figure 4-53. a. Install center keeper (54) and secure with four screws (51), lockwashers (52), and washers (53).  Repeat step for bottom keeper. b. Install top plate (50) and secure with six screws (47), lockwashers (48), and washers (49). c. Install latch (46) and secure with six screws (43), lockwashers (44), and washers (45).  Repeat step for remaining latch. d. Install locking bar and secure with screw (39), lockwasher (40), and washer (41).  Repeat step for remaining locking bar. e. Install locking bar keeper (38) and secure with four screws (37).  Repeat step for remaining three keepers. f. Install bracket (36) and secure with two screws (32), washers (33), lockwashers (34), and nuts (35). g. Install bottom catch (31) and secure with two screws (27), washers (28), lockwashers (29), and nuts (30). h. Install top catch (26) and secure with two screws (22), washers (23), lockwashers (24), and nuts (25). i. Install bottom handle (19) and secure with two screws (20) and lockwashers (21). j. Install top handle and secure with two screws (16) lockwashers (17) and washers (18). k. Install bottom cylinder brace (15) and secure with four screws (12), washers (13), and nuts (14).  Repeat step for remaining bottom cylinder brace. NOTE Perform steps l, n and o for left gas cylinder rack and steps m thru o for right gas cylinder rack. l. Install top cylinder brace (15) and secure with two screws (11), screws (12), four washers (13), nuts (14), and angle (10). m.   Install top cylinder brace (15) and secure with two screws (11), screws (12), four washers (13), and nuts (14). n. Install angle (10) and secure with two screws (7), washers (8), and nuts (9). o. Install slide (2) and secure with ten screws (6). p. Install plate (3) into cabinet and secure with four screws (4), and washers (5). q. Install gas cylinder rack and secure each slide with five screws (1).  Repeat step for remaining gas cylinder rack.