DMT XXC diamond plate, or Atoma 140 plate will do the job easiest. You
 could use drywall screen on a flat plate, butt that would be slower. Or
 the sidewalk.

On Nov 19, 2012, at 3:24 PM, Mark Fortune wrote:

> Dear Galoots, What would be the best bit of kit for flattening bench
> stones; I have amassed a good stock of bench stones now from car boot
> sales and flee markets, lots of different types, they are almost all
> badly dished with chips here and there, I have tried sand paper dry on
> float glass and end up with little dips, I think this is because I am
> not flushing the waste away and it clogs parts of the sand paper,
> maybe water would help? - I am currently using Japanese waterstones
> (which I keep perfectly flat) for lapping my chisels and plane irons
> but waterstones are such a pane cause they wear so quick and are so
> messy. I love some of my old bench stones and want to get them
> propperly flat. I want a tidy solution - aggressive cut as there is a
> lot of material to move and was thinking of buying a diamond stone???
> , any advice would be much appreciated. Mark
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