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Today I sanded the heads of a couple machine screws. The previous owner forced them to open the lock cover and left some marks and deformed the slots. I sanded them with 1000 grit sandpaper and then polished the screw head. You can see the progress in the picture above. Untouched screw, sanded, polished a little, polished. Now I'm wondering if I need to get them chromed again. Do you think they'll rust if I don't chrome them?

Cheers :)