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If you need to use a hammer, try a small tack hammer. Tap gently on a block of wood rather than steel so you don't thin and stretch the metal. For real small dents, you might try pushing them out with an awl or a carefully rounded screwdriver (from years of misuse). I've seen a guy use one of the screen door tools that looks like a pizza cutter to roll the dent out, also. Just go slow and check your progress frequently.
You need to make up some specialty tools, an aul out of an old broken scew driver and push the dents out while on a block, I also have a teflon piece that looks like a flat blade screw driver that works well. A small rounded hammer (miniature) for bigger ones then take a file to the high spots very carefully and then polish and buff. Very time consuming but they will come out.