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would the hardness of those old things really eat up the Dmt.
I starting flatting one of those made for sharpening up axes.
that where made nice and round it compared to water stones it takes ages.

What i like to do with the course norton oil stone that i bought at the hardwear store.
Is finish the flatting of my rock pile finds cause the fact they so easy to cog up.
So by cogging it with the...

The Cousrse side of that Carborundum stone is a much better choice then
the norton 220 in really taking steel off something.
But remmeber it cann't be lubed with anything so you have
uncog it...