Excellent picture Scooter!
Bravo, is there any chance what you’re seeing on your DLC blades where the washers are located, is possibly metal transferred from the washers onto the surface of the DLC?
DLC is pretty darn tough stuff, and doesn’t wear easily. I see this on DLC machine tooling all the time, and if well-cleaned, you find the DLC in near perfect condition, and what you thought was metal showing through the DLC is actually just metal deposits on the surface. Just wondering, especially with Scooters’ photo showing a near perfect DLC surface.