I just finished repairing my first used blade, and it had a chip about the size you described. I took it to my Norton 1000 and I lost count but I swear I had to do 1000 strokes to fully eliminate it, I was very tempted to take it down to my 220 but was warned against that as a newbie. Took a long time but it was worth it, just shaved with it. Smooooth:y