520tsc Foot Pedal

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I picked up a Chinese 520tsc 3 in 1 machine. Works okay for the prototype shop but the foot pedal supplied with the unit is not even close to the correct pinout configuration - anyone out there have a circuit diagram for the foot pedal and pinout connection sequence. My best guess is that 5 and 6 are the switch while 1 is the feed from the machine, 2 is the wiper on the pot, and 3 is the ground leg. Any thoughts out there? Thanks