To lighten a spring by polishing can be accomplished with a Dremel tool. You just need to:
Never let the spring overheat, have a water container handy, you grind it a bit and when you feel it heating you stop and dip into the water to cool. This will prevent the spring to loose it's temper.
Also, you grind it/polish it length wise.
That's the basics. Hope some expert comes along and explains it better.
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