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I have seen 2 of the DMT plates that were not flat. Be sure to check them.

My point is that the diamond plates do release fragments of the diamond grains thruout their use. I am not saying that the entire diamond grain is released, just a fragment. Thus there will be some...

Hmmmm, diamond plates do not wear down? I must have purchased some bad ones.

Just use wet/dry sandpaper. Do most of your work with a 120 grit and finish with a 220 & 500.
The flaws in the BBW an be sanded down ( smoothed over) or lap it all the way out.
I would forget about...