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I think I've fixed the problem. I ended up just getting more sandpaper and lapping the heck out of the stone for a while. It seemed like there were little tiny pockets, almost like what an air bubble...

I did use wet-dry sandpaper to do the lapping.

Randy, there are some irregularities--they look like they might be tiny pinholes--in the 8000 grit surface. But when I run my hand over the surface...

Well, I broke down and got a three-inch Norton 4/8k, which is a beast compared with the Japanese waterstones I'd been trying to learn with.

It seems like my technique on the 4k side is OK. I'm...