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Well, try with water first, I'd say, or maybe do water and then switch to oil for the finish if you really find it necessary.

No, the ones from woodcraft are not lapped, but, personally, I'd...

Should be safe, but why would you want to slow the C12k? If it was any slower, it would put metal back onto your razor.

Also, if you are in the US, you can get them at woodcraft.com or your local...