I have a Naniwa SS1000. I have to lap it so much it isn't funny. Once it even developed a "worm hole" looking thing that took alot of lapping. Kinda reminded me of something plastic set on the hot coil of a stove. I'm surprised I have much stone left & I ain't even had it a month.
As soon as my DMT's come in, this one will be donated.
I haven't owned alot of stones in my brief career as a wet shaver, but this one was a waste of money.
OP, lap that thing!