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Task 1, Battery Installation (photo 1)

Solder the two battery casing wires to contacts on the printed circuit board. One wire must be connected to ground and one must be connected to a contact so that the wire can be electrically connected to the potentiometer.

Glue the battery casing to the PCB. Hotmelt, a hot glue gun can be used for this step.

Task 2, LED installation (photo 2)

Drill a hole on the side of the plastic casing to fit the LED light to provide a tight fit.

Solder the two LED light wires to contacts on the printed circuit board (one to ground and one so that it can be electrically connected between the potentiometer and the motor.

Carefully press the LED light into the hole using pliers.