I am trying to get my Norton Flattening stone flat, as last night I ended up with a slightly uneven lap on my Norton 1k.

I picked up a ceramic tile and I was thinking about giving the flattening stone a go on that with a low grit paper like a 220. Would that work? Is the ceramic tile going to get it flat enough? The tile sure seems flat, but you can't really tell by eye, I suppose.

Has anyone tried this? My guru is reluctant, as he hasn't heard of anyone doing this, so I figured I'd ask opinions.