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Wow, that's nuts for such a thick hone. Live and learn, huh? When I first noticed the issue, the warping aggravated my OCD. But, since then I realized they still work just fine. Take a few deep...

The reason I do figure 8s beforehand is for the slurry effect, mainly on the lower grits. I've checked them and they are flat enough on top even though a couple have serious air gaps at the ends...

After soaking -- or stabilizing -- each stone per Glen's 3-part Naniwa SS honing videos.

The SG20k surely doesn't seem to absorb any water at all, or if so, it's approximately what botanic described as 0.3mm into the surface, or effectively nil.

My Naniwa Super Stones have all...