Quote Originally Posted by 0livia View Post
In that case, yes.

Don't flatten one hone with another.
We did that with 60 x 80 cm lithos in school and ended up with all dished ones. Great joy, LOL
If you do stone against stone, they will eventually compliment each other. The concave (dished) stone will wear the other stone to become convex. I've heard that lapping using this method requires 3 stones and are lapped something like this:
A-B
B-C
C-A
C-B
B-A
A-C....

I've never tried it, but it seems a little complicated. You'd have to mark each stone if you use the same grits.