HOMCOM A90-318 Assembly Instruction Manual page 9

Step 5:
Using Allen bolt (21), Flat washer(5) and Nylon nut(6) to lock the Left swing
arm D on the Left base B, and lock the Right swing arm E on the Right base C.
Step 6:
Using Allen bolt (8), Flat washer (5) and Nylon nut(6) to lock the left Cylinder to
the Left base B and aluminum clamp (16), and lock the right Cylinder to Right
base C and aluminum clamp (16).Then cover the nut cap(11).
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