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Thanks for clearing that up. The only issue I've had with Sandpaper was too much pressure, and only with a Swaty. Since then I use a lot less pressure. Good to know that hones don't cross...

I go up to 1200 paper but yeah. Your thinking is correct. I guess I would lap the 1k on a flat surface with sandpaper, and maybe finish lapping the 4k/8k on the 1k, but I would still be cautious.

There will be if you lap too aggresively- but the bigger issue then is grits break off and scratch the hone. My issue with two stones being rubbed is they have the same bonding agent so they would...

My two concerns would be:
a) grit contamination
b) what if your 1k is not flat itself?