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i usually lap then bevel then a quick lap just to clean off any loose stuff from the beveling. But yes, i see what you mean. I put quite a large radius on the bevel though so few thou's (probably?)...

If it's wet and dry sandpaper that should be fine. And will be fine to lap it on as well. I've Lapped my norton on up to 800 grit. and that's harder than a naniwa (of which i have a 12k)

Bevel the...

you need to bevel the edges, Naniwas are fairly soft so not hard to do

I use the norton lapping plate from my norton kit (the one thing it's good for), or 400 grit wet and dry (used wet) would do...