Alternative to sheetmetal shrinker?

Syleng1 said

Heat red with a small torch and wipe with a cold wet rag to quickly cool. Wear gloves because steam and heat will burn your skin. Worked for years for body shops before fancy equipment.

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Absolutely this will also work as well, unless he doesn't have a fancy tool like a oxy setup. :)

Just bustin yer chops.

There are a lot of ways to do it without a "shinker", that's for sure.