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Milt, I've gotten rare earth and electro magnets from McMaster Carr in the past. I don't know what the price is, but I was thinking an electro magnet wired to a rheostat might give you some control over the strength of the field.
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"Prayer isn't a parachute. It's a compass. It doesn't save you from the storm. It guides you through it." - Bear Grylls
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