How to reduce the height of the skived fin heat sink and process it to a suitable height?

How to reduce the height of the heat sink and process it to a suitable height? This is because the fin thickness of the processed heat sink is between 0.8 and 1.2mm, and it will deform after direct processing. We have special machines to process and control this height, which can generally have an error value of around 0.1mm.
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