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Ah, that would explain the black "slurry" I was getting, and the lack of polishing on the Swaty. Nickel substrate coming off the finer-grit DMTs? Ouch. :gth

Oh well, I got a good year's use out...

Thanks guys. Chris, you're right, there's still significant surface scratching from the lapping, so I'll keep at the polishing with higher grits. I have a DMT 1200 and a DMT 8000, that's the best I...

I recently bought a bargain ($10) 3-line Swaty off eBay, my first! It had a sizable chip on the main face, but was pretty clean on the rear side. I figured it was worth a try at saving. So, I...