# Step 10: Attach the Elbow Housing Plates

> Attach parts 400_08A and 400_07A to part 400_15C with threadlocked M4x16 Flat bolts, and secure part 400_07A to actuator ID 16 with threadlocked M3x12 Flat bolts.

- Page: https://docs.menlo.ai/asimov/1/build/assembly-steps/left-arm-module/forearm-assembly/step-10
- Section: Asimov › Asimov 1 › Assemble Asimov 1 › Assemble › Left Arm Module › Forearm Assembly
- Previous: [Step 9: Install the Elbow Actuator and Route Its Cables](https://docs.menlo.ai/asimov/1/build/assembly-steps/left-arm-module/forearm-assembly/step-9.md)
- Next: [Step 11: Attach the Elbow Shaft Plate and Actuator Housing](https://docs.menlo.ai/asimov/1/build/assembly-steps/left-arm-module/forearm-assembly/step-11.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 |
| - | -: |
| Elbow actuator-and-housing assembly from Step 9 | 1 |
| `400_08A` | 1 |
| `400_07A` | 1 |
| M4x16 Flat bolt | 10 |
| M3x12 Flat bolt | 6 |
| Threadlocker | As needed |

## Instructions

1. Take part `400_08A` and align all the 5 holes on the part to fit the threaded insert on part `400_15C`. It should cover the actuator bottom near the port, not the actuator shaft.

2. Take **5 of** M4x16 Flat bolts and lightly tighten into 5 holes on part `400_08A` to align with part `400_15C`.

3. Flip the assembly over such that the actuator shaft is not facing toward the ceiling.

4. Take part `400_07A` and align all the 5 holes on the part to fit the threaded insert on part `400_15C`.

5. Take **6 of** M3x12 Flat bolts and lightly tighten into 6 holes on part `400_07A` to align with the threaded holes on the actuator.

6. Take **5 of** M4x16 Flat bolts and lightly tighten into 5 holes on part `400_07A` to align with part `400_15C`.

7. After the parts are aligned:

   > [!NOTE]
   >
   > **Not ready to apply threadlocker?**
   >
   > You can assemble without threadlocker while you check the fit, alignment, and orientation. When you are confident, disassemble as needed, apply threadlocker to the bolts, and reassemble them following these instructions.

   - remove **6 of** M3x12 Flat bolts one at a time in a star formation,
   - apply threadlocker,
   - then tighten them back to secure Part `400_07A` and the actuator together.

8. After the parts are aligned:

   > [!NOTE]
   >
   > **Not ready to apply threadlocker?**
   >
   > You can assemble without threadlocker while you check the fit, alignment, and orientation. When you are confident, disassemble as needed, apply threadlocker to the bolts, and reassemble them following these instructions.

   - remove **5 of** M4x16 Flat bolts one at a time,
   - apply threadlocker,
   - then tighten them back to secure Part `400_07A` and part `400_15C` together.

   Flip the assembly over and repeat for the **5 bolts** on part `400_08A` from Instruction 2:

   > [!NOTE]
   >
   > **Not ready to apply threadlocker?**
   >
   > You can assemble without threadlocker while you check the fit, alignment, and orientation. When you are confident, disassemble as needed, apply threadlocker to the bolts, and reassemble them following these instructions.

   - remove **5 of** M4x16 Flat bolts one at a time,
   - apply threadlocker,
   - then tighten them back to secure Part `400_08A` and part `400_15C` together.