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Nice research, rum! I couldn't for the life of me find a UK site selling Nortons. See what you mean about the price though. For the price of the Norton 4k/8k on that site I'm getting the 4k/8k, a...

I purchased my coticule from a Dutch site that included a fragment of the same stone to be used as a Nogura stone. They were extremely helpful, and if you contact them they might be able to help.
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