Step 1: Install the Shoulder Hardware

Take part 100_01C and flip it upside down such that the neck is facing toward the surface while the waist is pointing toward the ceiling. The hollow part should be facing you.

Inside of the hollow part, at the neck area, you should be able to locate 2 indented slots. Take 2 - M6 nylon insert locknuts and slot them inside those 2 indented slots. Make sure that the white part of the nylon insert is facing toward the neck area, not facing toward the shoulder.

Rotate the shell 90 degrees anti clockwise, you should be able to see the right arm hole. At the shoulder position, there should be 2 parallel slots there. Take 1 - Chain shackle and slot its leg into the slots. Use your hand to keep it in the slots.

Around the circumference of the arm, at the shoulder, you should see one round hole. Take 1 - M6x85 socket bolt and insert it all the way into the hole and tighten the bolt to help secure both the chain shackle and M6 nylon insert locknuts in place.

Once you are done, rotate 180 degrees so that you can see the left arm hole. Repeat the same step as above.