|LEGO → System → Service Packs|
- The key was often the first part to break, because of the torque needed to wind the motor. Therefore this replacement set was released one year after the motor.
- The shape of the junction of the key with the motor is based on a square section on the motor, but the key has a star section (combination of two squares rotated of 45 degrees) to allow easier insertion, every 45 degrees.
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