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I prep all guide feet with a Dremel and then hit them with a wire wheel to remove any sharp edges or burrs.
The use of a Sharpie marker can promote corrosion due to the high chloride level in the ink. Sharpie does make a "TEC Marker" that is trace element certified and contains only trace amounts of chloride, the preferred marker to use on metals. Nail polish or paints are much safer for guide feet. I use Testors paint or nail polish when coating prepped guide feet.
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