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I get about a dime size red then quench it then move about an inch or so away then do it again till I get the results I am looking for. I hammer and dolly the raised spots out and see if the oil can is gone.
To keep the shrinking disk from squeeling put some bar soap on it and keep a little water and soap in a spray bottle on the surface to keep things lubed. It will keep the disk from galling to the metal you are heating with it.
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