# Step 1: Install the Shoulder Hardware

> Install two M6 nylon-insert locknuts and two chain shackles in the torso shell with two M6x85 Socket bolts.

- Page: https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/torso-assembly/step-1
- Section: Asimov › Asimov 1 › Assemble Asimov 1 › Assemble › Torso Module › Torso Assembly
- Previous: [Step 14: Right Arm Verification](https://docs.menlo.ai/asimov/1/build/assembly-steps/right-arm-module/final-assembly/step-14.md)
- Next: [Step 2: Install the Waist Plate](https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/torso-assembly/step-2.md)

> [!IMPORTANT]
> **Assign actuator IDs before assembly**
>
> Assign and verify all 25 actuator IDs before assembling the robot. The robot will not work correctly with missing or incorrect IDs. IDs must be assigned one actuator at a time on the bench; you may need to disassemble the robot if you skip this step. See [Assign Actuator IDs](https://docs.menlo.ai/asimov/1/build/assembly-preparations/assign-actuator-ids.md).

## Parts needed

| Part | Count |
| - | -: |
| `100_01C` | 1 |
| M6 nylon-insert locknuts | 2 |
| M6x85 Socket bolt | 2 |
| Chain Shackle (part `100_07X`) | 2 |

## Instructions

1. 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.

2. Inside of the hollow part, at the neck area, you should be able to locate 2 indented slots. Take **2 of** 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.

3. 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 of** Chain Shackle and slot its leg into the slots. Use your hand to keep it in the slots.

4. Around the circumference of the arm, at the shoulder, you should see one round hole. Take **1 of** 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.

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