Maybe related :)
It's a very fine pre-polisher for me tho I have shaved off it. Very quick to clean up an 8k finish.
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Attachment 264629
Here is mine, I love it very nice edges. Even a little better than the yg/blue thuri and thats saying something. I too had the naniwas for about ten years but thuris and nakayamas are definately better for smoothness. Like butter they say.
When you learn it well it will be even better!
Cheers, Steve