An Idea sent in by Brolifen

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https://imgur.com/a/j2auKli

The third diagram has potential.  Instead of brushes, I would put the RF Nano instrument package.  I think there may be enough systemic capacitance to see a voltage -- Excellent idea.   Would also setup the stepper motors to roll back and forth and synchronously sample to boost SNR. 

Will put this on the TODO lost 

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