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For doing Ark type hardness stones, you need much more that 400 grit, I start at 60 grit loose Silicon Carbide to get to flat, a teaspoon is all you need add as it wears out. A little goes a long...

Yup, they work, used them for years.

There is a guy on EBay selling thin 1k plates 8X3 for under 20 bucks ( about $17, last time I purchased they were 12, when I first bought). I use them as is,...