You will now attach one Servo Arm and the Ultrasonic Module. Find the following materials in your kit:

First, grab the servo arm and four M1.5x4 self-tapping screws.

Place the servo arm on the bottom of the chassis and add the four screws as shown below.

Next, get the A8 plate, Ultrasonic Module, and two R3090 Rivets. Insert the Ultrasonic Module and place the A8 plate directly behind it. Insert the two rivets as shown in the diagram below.

Once the rivets are in place, push them to lock them into place.

Finally, insert two M3x6 screws with two M3x26 standoffs into the screw holes as shown below.