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but I suspect CC buys it from another manufacturer
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correct.
i don't have one, so i don't know for sure... but i suspect that they use a hall effect sensor.
link
they are available in different polarities & voltages, so you'll need to open up the stock one to id it or probe a working sensor.
if the sensor has only 2 wires, its likely a reed switch.
link
cheers,
-sj