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It's a great way to ruin the temper of a spring and weaken it significantly. At least, the home-brew "torching" is. It sounds like they may do post-treatment to make sure the metal is re-tempered, but I still wouldn't trust it. And I really would not trust myself to do it at home!!
Nor anyone else, for that matter.
It's easy enough to buy springs in just about any rate you want with just about any free length.
-soD
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