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Lapping it with another hone will renew it. So will sandpaper on a piece of marble or a counter. the action of rubbing 2 hones together will create slurry.

I would do it over running water if...

Hey Xman,

What do you mean by renew the barbers hone?

Typicaly they are lapped in pairs. one hone rubbed against another, wet.

Don't rinse the slury. helps with the honing.