I bought an Atoma #140 to use to flatten my Shapton Pro stones. It's not perfectly flat. Laying it diamond-face down onto my granite surface plate, the 0.0015" feeler gauge can slip under the middle of the Atoma without any resistance. The 0.0020" feeler gauge however drags just enough that the diamonds leave scratch marks on it even as it roughly slips past them. I interpert that to mean that the Atoma is hollow by somewhere between 0.0015" and 0.0020". Is that flat enough to flatten the Shaptons since every single thing I sharpened will, by proxy, be referenced against the Atoma?
Thanks as usual.