Well, I got curious last night and got out the diamond hones. I ran it back down as close to zero as I could get it and did a little testing. It fared a little better, but not much. It certainly isn't robust enough to qualify as light duty capable on my scale. Trimming my fingernails would overtax it, and I don't open that much mail. I've convexed it a little now, so I'll see how it does.