Thing is that many people claim that Chinese stones glued onto their plastic blanks are often, if not deformed and detaching from their blanks right out-of-the box, than they get deformed and getting detached after water is applied to them.
So checking whether or not they are flat is essential in my view.
And procedure is fairly simple and doesn't require any measurements, just: a pencil, or a marker, a pinch, or two of the silicon carbide powder, a piece of a flat glass, or a mirror and a few teaspoons of water.
So checking whether or not they are flat is essential in my view.
And procedure is fairly simple and doesn't require any measurements, just: a pencil, or a marker, a pinch, or two of the silicon carbide powder, a piece of a flat glass, or a mirror and a few teaspoons of water.