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Sorry for that.
1- Yes, I lapped it before first use and I lapped it another time after I noticed the scratches
2- Yes, I did after lapping
3- using directly on water. Even tried under running...

Hello,
I got a new Shapton Ha-no-kuromaku 12k und an new Shapton Ha-no-kuromaku 8k. After testing these stones I am not sure whether the 8k ist finer than the 5k Shapton Pro. The biggest problem...