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Well, for what I think you paid for the Shapton, you could have had either a Naniwa 3/8k combination, or a Norton 4/8 k combination, either of which would have served you better for what you want to...

I know nothing about Shaptons since I have Naniwa, but IMO it's going to take a LOT of strokes to get that chip out on a 12k stone.