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Yes, MAPP gas is actually a good move. Heat is another way of accelerating destruction though. I would not use oxy acetylene, and use an IR thermometer. I would probably stop well short of 200F. Hot to the touch, not red hot. The problem with heat is that the steel race will remain much harder than the aluminum. Since you're throwing the race away, just tap it out. And a brass drift will not last two good whacks.
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