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That is Alx's stone I believe. I gave it a try too, and I measured the radius of the dish at 540mm. He cut it very uniform and I calculated the increase in angle and it was about like a layer of...

I save lapping slurry too, JNat thpugh. I put it on small piece of lint-free shop cloth and use it to clean razors, polish everything from steel to fountain pens to jewelry. It works really well.
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