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I feel sorry to let you know that not all DTs get to the 8ks grit even with what you call proper lapping. What I wrote is from my personal experience with more than dozen of DTs. It is not a bible...

From my experience DTs vary in their grit. It could be because that they not come from one quarry/location only. Slurry speeds up the work (and it does not clog up so fast) as well as few people lap...