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Sounds like the PB-6 you got doesn't have a microswitch on it. It came with no diagram eh?
The PB-6 is just a potentiometer. A pot has 3 lines; power, and two outputs. As you rotate the pot, one output voltage goes up and the other goes down. So, if you get them switched you just change them. Nothing will get damaged. You can test this on a bench with a voltmeter and a battery or power supply.
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