Hi! I was joust thinking if you could make a spring streach, by conecting it to a dome of a Van de Graff generator. I thought I would hange a spring from a stand and put a small weight on it. Than I would charge it with a VDG (look at the attached picture). But I'm not shure if it will work, I don't know if the force betwen the wrappes is large enough to produce a wisable change. P.S. Could enybody give me a hint on how I could calculate the force betwen the wrappes of the spring. Please.