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I remember reading that Instructable a while back. I like the yard-stick-bow-saw design.
Maybe something like that with just a long, light spring on the bottom.
The spring on the bottom would force the top ends of the sticks apart, and the spring would be AWAY FROM the hot/electric components.
I don't think a guitar-tuner-type tensioner would work. The wire tightens and slacks very quickly when power is applied or turned-off.
I'm just playing around to learn right now, but when I am done, I might want something like a 5' long, hand-held cutter. That way, I could make a single cut all the way down one side at a time across the back of a pickup truck.
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