I don't think it's been mentioned but you can do some planishing with a wooden or a leather faced slapper against a steel dolly. These softer materials will average out the highs and lows with less stretching. Also, Cass has talked about using a magnesium hammer or slapper to fine finish aluminum. The theory being that the magnesium tool being softer than aluminum, will slightly deform while rearranging the aluminum.
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Bob
Don't believe everything you think.
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