Just got another phig yesterday. I had one lapped it for an hour, sold it bought another. Lapped this one for an hour also. I know there are all different but I feel like I got the same one twice. 2 lower corners. Anyway had a go today.Chosera 1k, norton 4/8 . I did about 40 figure 8 to bring up a slurry. The stone feels like glass but yet its gritty when im honing with it. I lapped with 325,600 dmt. I guess I got a dog like my first one. It game me a decent hht after the hone, but i can get one after the 8 norton. 50 half strokes, 50 circles on slurry dilute then 20 x dilute to all water and 20 x. Stropped and hht 3-4. Same hht as my coti. So the verdict? Sounds like the 12k is an 8k.