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I’ve had a lot of success using a MIG welder for shrinking. Depending on how much I need to shrink, I usually just lay down a few dots, quench it, check the fit, and repeat if necessary.

If I need a bit more pull, I’ll drill a small hole, fill it with weld, and immediately quench it.

This method is especially effective on tricky areas where you can’t use traditional oxy-acetylene method.