While on the subject. What is the recommended method for flattening 400 grit stones and lower? I've used my DMT x-coarse on my Chosera 400 a few times and it has really mellowed it out. I actually like where the DMT is at for flattening my 1000-10000 grit stones right now but am afraid that it will be useless if I continue to use this on the 400. I am not about to delegate a diamond stone just for the 400 and watch it get worn out before long. And I really hate the sandpaper method. The loose grit is something I've never tried on stones. What is needed for this method and is it easy enough?