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So Tom, I guess your stones must be curved to fit the concave ?
Looks like you have the beginnings of a nice hazy Kasumi style finish.
I suppose you could shape a piece of Uchigumori or Narutaki...

Congrats on your first Tom. Interesting concept on the slip stones. Bit like Japanese sword polishing. Kewl :)
A little more elbow grease & those minor scratches are history.