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But first the origin of this post, being as often a Christoper Schwarz post. In a recent post he favors diamond based over stone-based flattening systems for flattening his waterstones and oilstones. The problem with flattening stones being the near impossibility to keep them flat.
Before I even heard about Japanese waterstones or Belgian slate I took some interest in stargazing. This interest is too recent to have seen the numerous workshops about telescopic mirror grinding. Today mirror grinding lost most of its interest as it is easy to find large finished mirrors and telescopes for the price of the material, where 30 years ago it was possible to first grind a decent 6" mirror and while learning continue with a 8" or 10" .... 40" in search of the 'big enough telescope'.
http://extabit.com/file/2b4txb87st4bf/The Complete Guide To Sharpening.rar