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Jim,
That is easy! I have used a vibrator out of the MOT & set up a coil driver. Bet with sufficient current it would work on 3 volts D.C. Need to have a good ampere supply to saturate the primary windings more than higher voltage. I don’t think even "D" sized battery will last very long. Example: Set up flashing L.E.D.s for a fake candle inside a repo looking wall clock. Even the LED load depleted the "C" sized battery after 36 or so hours. Bet you need a small 6 volt motorcycle (Scooter) to supply the needed amperes just like the early outboards. The coils draw around 2.5 to 3 amperes readings on my Merc o Tronic meter. Do something trick like use a photovolatic cell to charge the battery while stopped to fish using the lead acid cells in that battery.
Or a few to get a fast charge.