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As for lapping the two sides for starters, I would recommend leaving one as it is out of the box and lapping the other to 600x. See what that gets you. Further smoothing on that side can either be...

6" x 2" is fine. 5" x 2" used to be a standard dimension. I like that too.

To lap a translucent Ark, I have used 120x, 240x, and 320x silicon powders on a 1/4" thick sheet of plate glass. Place...

Yes, this one as linked is a finisher. The first one as linked, marked "hard Arkansas" on the box, was not.

As for lapping the Arkansas, there are different schools of thought on this. Dan's...

The stone that the OP posted is not a finisher. "Hard Arkansas" as given is a bit of a misnomer. Actually, it is a soft Arkansas stone. What happened is that the grading system was changed. The...