Might want to rethink the water hose/electricity thing.:eek:
Just use low amperage/voltage current (i.e. 1.5v. batt’y) and lessen the danger. The “lead” in lead pencils is mostly graphite (though I’m not familiar with the mark sense formula) and graphite is quite conductive. What you basically have is skinny motor brushes for a universal AC/DC motor.