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>>/29246/ Yeah I did it by hand, if it were a bigger coil a power drill or a lathe might make the job easier The coil in this vid has 300 windings; https://youtube.com/watch?v=LbTyEratSTI I doubt it will make that much of a difference that my coil has 200 windings. What matters it that it goes into resonance when activated, by using the right circuitry for it.The primary is just a few loops of thicker wire around the secondary so that should be easier.