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I made one a year or two ago. I used some stainless wire safety wire that I had around and tensioned it with a door spring for the same reason as you mentioned. My spring is about 3/4" diameter and 6" long. I powered about 26-28" of wire.
I used a board with end boards to space the wire off the neck board.
I powered it with a 12v 6a battery charger after testing it on the 2a setting first.
Of course the wire stretches because it gets hot. If I went too fast it would still bow some.
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– Noah Webster, 1787
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