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There is a film available somewhere in archives of Czech television. Hovever there is somwhere link here showing the gadget Henk uses.

They do not. At least manufacturers I have seen use horizontal disc about 2.5 metrs of diameter slowly spinning. Filled with wet sand with few bars spaced like spokes. You put hones ont that disc it...

For initial flatenning of bad dishes I use a good quality dry small diamond saw blade on my angle grinder. Then again used 6" wide dry linisher belt grit 40 glued to a piece of scrap granite work...