x4
x4
-
+
-
+
-
+
-
+
x4
x4
10
11
12
13
14
X2
X2
X2
X2
X2
M
N
O
L
K
K
12
2
3
14
Insert HW③ in part K
Install part O in L,M,N
Use HW⑭ to install part L,M,N together
Insert HW② in part L,M
Install part K,L,M together
Use HW⑫ to install sliders on part L,M