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My DMT 325 is more than flat enough and is a 1/4" steel, so you're not going to deform it out of flat. I got the lapping plate first, didn't like the large grit size, so I went with the 325. I'd...

I have the lapping plate. If it's the same one I have, it's about 160 grit if I remember the packaging right and very gritty...I also have a DMT 325 grit 8" x 3" which is more appropriate, in my...