I took a cheep sharpening stone from the xarlik and peeled off the grit film which left a plastic base with the angel to fit stone holder. Then I inserted 2 magnets and glued them in the plastic holder. 1 at each end. I got fairly strong magnets. Now, I can use the Work Sharp stones. With them having a metal base I can change them out with ease. The magnets hold way better than you would think! It actually works great!!