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Thanks for the neat last picture, Chris. It might suggest that your hone isn't carborundum, but corundum. Both materials are, as expected from the names, very closely related.

If you have an...

I've lapped several Swatys and Carborundum Co. hones. My Carbos all seem to be considerably harder than the Swatys (2 and 3 line), based on lapping time and swarf build up on a DMT. I also think that...

+1. Looks like my Carborundum Co. hones too.