The diasharp are good- I use the extra coarse 220 grit to supplement the 3 standard EZ lap stones that Paul suggests. It is excellent for grinding and shaping although typical sharpening just needs the standard 3 EZ laps.

I tacked two battens (paint mixing sticks) onto a piece of ply, spaced equal to the length of the stones. A ply cut-off is screwed to the bottom to grab with the vise.

I often want to sharpen off the edge of the stone, e.g., when flattening the back of an iron, and having them between battens means I can move any stone I want to the edge of the holder and can rotate it to use both edges. I would never want to glue down the stones for the way I use them because I would not be able to push the stones to the edge.