Good point, though you could always stop with whatever grit left you the right amount of roughness.
Actually I believe you probably could lap a V-groove (by flipping the matching block over occasionally) and end up with something flat on both sides, but not necessarily a precise right angle.
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Actually I believe you probably could lap a V-groove (by flipping the matching block over occasionally) and end up with something flat on both sides, but not necessarily a precise right angle.