Okay, cool. I was hoping it was okay. First because it was happening on parts of the device that I was reasonably sure I hadn’t screwed up. (There are precious few of those). Second, because the parts of the rail that experienced the wear roll silky smooth in comparison to the rest, and thus it seemed more like wear-in as opposed to wear out.
If the zinc is grinding off, should I be thinking about oil or other corrosion preventatives/lubricants?