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The Norton lapping hone never should be used on a natural hone.

The reason that I said that the lapping plate is a convenience and not a necessity for a natural hone such as a Chinese hone is...

Yes, it is adequately flat.

Yes, but like any other lapping with it, do it under running water, just use the weight of the hone, and frequently remove the hone to rinse out more of the accumulated swarf.

If you only want it...

The 325. The DMT hone series never was intended for lapping but the more coarse grits survive better. The 325, as long as you do not abuse it will serve as a workhorse for a long time.