Step 17
Insert Hardware N into Part 2&4 and place 11 on N
Step 18
15
O
O
13
Connect Part 15 to 13&14 with Hardware O
Insert Part 16 along the slots of 13&14
Install Hardware L to Part 12 with M and connect
12 to 13&14 with B&A
N
N
N
O
O
14
16
N
11
A
A
B
A
B
M
M
B
12
Ax4
Bx4
Nx4
A
B
Lx1
Mx2
Ox4