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Have you thought about a BBW? These usually come quite cheap in reasonable (make sure of that, please) sizes.
A BBW with water could be used after a 2.000, and without water or with slurry diluting...

That´s a King brand 6.000 stone. It is not uncommon in Germany.
Here most people tend to say stay away from the Kings.
The only exception are a few of the single (not combination stones)
like the...