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You might like to consider getting the switchpilot companion relay module. This will plug in to the switchpilot and provide relays that work in conjunction with the servos to switch the frog polarity, much easier than messing about with micro-switches.

Using a DC switchmode power supply will be ideal for powering the switchpilots. 16V DC will be fine to use directly, there is no need to regulate it further.
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