# Step 3: Install Actuator ID 10

> Install actuator ID 10 in its mount, connect it to actuator ID 9, and secure the assembly.

- Page: https://docs.menlo.ai/asimov/1/build/assembly-steps/right-leg-module/thigh-assembly/step-3
- Section: Asimov › Asimov 1 › Assemble Asimov 1 › Assemble › Right Leg Module › Thigh Assembly
- Previous: [Step 2: Install Actuator ID 9](https://docs.menlo.ai/asimov/1/build/assembly-steps/right-leg-module/thigh-assembly/step-2.md)
- Next: [Step 4: Attach Part 500_06A](https://docs.menlo.ai/asimov/1/build/assembly-steps/right-leg-module/thigh-assembly/step-4.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 |
| - | -: |
| Assembly from Step 2 containing part 500_03C and EC-A3814-H14-107 actuator (part `500_02X`) (ID 9) | 1 |
| EC-A4315-P2-36 actuator (part `500_07X`) (ID 10) | 1 |
| `500_05A` | 1 |
| M4x14 Flat bolt | 6 |
| M3x20 Socket bolt | 1 |
| Threadlocker | As needed |

## Instructions

1. Take part `500_05A` and lay it flat on a surface such that the hollow part is facing upward toward the ceiling.

2. Take the EC-A4315-P2-36 actuator (ID 10) and align the actuator port with the port cutout on part `500_05A`. Then, slowly lower the actuator down into the slot. Put the assembly to one side after done.

   > [!WARNING]
   >
   > **Check for fit**
   >
   > Since this part has very precise tolerance, you need to align it perfectly so that the actuator and the part fit together smoothly. The actuator needs to bottom out and align properly with part `500_05A` or else you will have a fitting problem later on.

3. Turn Part `500_03C` from previous step around such that the L shaped grove is still facing upward toward the ceiling and the actuator is facing away from you.

4. Take the XT30 (2+2) connector that is routed through the trench of part `500_03C` and connect it to the port on actuator (ID 10).

5. Take actuator (ID 10) and part `500_05A` and slide it through the round hole on part `500_03C` such that the port cut out from part `500_05A` aligned with the L shape cut out on part `500_03C`.

6. Take **6 of** M4x14 Flat bolts and lightly tighten into the 6 holes on part `500_05A` to align it with part `500_03C`.

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** M4x14 Flat bolts one at a time,
   - apply threadlocker,
   - then tighten them back to secure Part `500_05A` and part `500_03C` together.

8. > [!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.

   Take **1 of** M3x20 Socket bolt, apply threadlocker, and tighten it into the singular hole at the very edge of the circumference of part `500_05A` to secure it to part `500_03C`.