This post won't get a lot of replies but I just want to share it because some questions pop up from time to time about this. A while ago after wearing out a diamond plate (CKTG cheap one) I bought a Naniwa truing stone and Chosera Nagura, total spent around 50 CAD. I must say that I'm quite satisfied with how it works, sure the stone is not ''true'' flat but mostly flat seems works just as fine for me, it gets out of flat after a few strokes anyway. The Chosera nagura gives a nice surface texture to the stones (1000 and up) and I use SiC powder for coarse stones. I bought another diamond plat (DMT D8XX this time) anyway but I don't use it much. I know these truing stones get a bad reputation around here, and I myself bashed it before using one for real. Anyway...just wanted to share that this flattening solution is not half as bad as some people seem to believe. Plus, I don't see myself wearing one out any time soon. I rub it from time to time on a cinder block with SiC powder to make sure it stays flat. There was also a huge plate from Naniwa available, but storage was an issue, probably work really well.