Quick question to those with more knowledge than I, but I picked up a Carborundum 118S in very good shape for dirt cheap. Looking online through various forums and here on B&B, there is very little information on the as to where these synthetic hones fall grit-wise (I've seen anywhere from 4K to 8K to unknown, and others have used them as bevel setters) and their hardness level. It came in the box, was labeled as a razor hone and was made/sold in 1965 but it appears to have seen little use. Laying it on a piece of polished granite, you can see a slight glimmer of light in the center of both sides, so it has been used and will need to be flattened before using it to hone, be they razors, knives or chisels. I saw one comment that carborundum hones can be difficult to lap/flatten due to their hardness, but I'd appreciate any feedback on what to use to flatten it, as well as any guesses as to where the grit level of a 118S might fall. It's only 4x2x3/4 in size so not optimal size-wise, but I got it dirt cheap.