Well, got my Norton set.

I just finished flattening the 250, 1000, 4000 & 8000 stones.

Man! It took me along time to flatten the 8000.
Then I figured out that the flattening stone was loading up.
I used a washrag to scrub off the 8000 grit from the flattening stone.
It took me so long to figure it out (1/2 hour) I got a blister on my index finger!

Hint... scrub down your flattening stone (don't just rinse) or you'll be flattening forever!