It can be put in a mold and poor into a a GIPS - Ri gips or plastificant de Paris it is caled in USA . The natural , and the fine hones qcrack very easily . I have a coticule that cracs during the lapping process . They have to be treated very carefuly .
I think , that the Apachee hone looks amasing , almost sure ,that it works briliant . If you broke one buy another , you will use the broken as nagura or slury stones.
Unfortunately those hones are not avaible here in EU .