Is it a brass pin, or nickel? If so, it should be relatively easy to sand with some high-grit paper (600-800+) without doing much or any cosmetic damage to the scales. Pakkawood is (I think) a wood laminate/resin composite, sort of like stabilized wood, and it sands & finishes pretty easily; so, if you're concerned about damaging it, the higher-grit paper in SiC or AlOx should leave a decent or nice finish. If I were to try it, I'd wrap a small piece of sandpaper around a small wooden block or stick; use it sort of like a file, with very gentle pressure. Even if the pin is stainless, SiC or AlOx sandpaper (wet/dry) should handle it pretty easily.
David