Quote:
it's just a momentary switch that causes the radio to scan up to the next station it finds

It sets the bit of string to work over the pulley, when it comes to the microswitch at one end, the motor reverses and it goes back the other way.
N.B. Philips made the car record player, it played singles, so imagine, Empeg owners, having to take the disc out in traffic every couple of minutes, the stylus was, as commented upon, upwards, but to avoid skipping, the spring was so heavy, neither record nor stylus lasted that long.
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Politics and Ideology: Not my bag