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Well, when I lapped my nortons with sandpaper, the surface would be flat, but not 'open'.With the flattening stone, the surface becomes as porous as the day I first used it.

If I plonk my 1K/4K in...

I did. My coticule is small (6*1.5) so I just made sure I used the entire flattening surface to prevent uneven wear. I also used very little pressure.

But it worked like a charm as well.
I think...

Today I finally got to use the norton flattening stone I bought from howard.
O-M-G

This is just so much better than messing about with sandpaper.
My stones are much flatter than they used to be....