Introduction
In this guide it is not necessary to replace the motor but you do need to move it out of the way to reach the switch.
Tools
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There are two screws that require a 4.0mm flat head screwdriver. Twist them counter clockwise to remove. When you remove them they stay contained within the blue outer case.
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Pry the batteries out with your finger. When you replace them be sure to orient them correctly according to the markings in the slots. Match the plus symbol on the battery to the plus symbol in the slot.
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Remove the motor by lifting it out of the shell, and find the attached wires at both ends: the circuit board and the motor itself. Use the soldering iron to remove the existing attachments by heating the solder joint with the solder iron tip while pulling on the wire.
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Remove the existing attachments at both ends of the wires with the soldering iron. Heat the solder joint with the solder iron tip and pull the wire.
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To reassemble your device, follow these instructions in reverse order.