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Yes regarding the screwdriver. However, unlike with honing, you need to go ALL THE WAY to the end of the plate.

I don't think there is a proper lap number. I guess I'd start with about 3-5...

You WILL need to prep your DMT plate. Though it is "flat," not all of the peaks of its diamonds are the same height. IF they were, then you would get a relatively uniform surfacing of the hone by...