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Dulling a razor on glass is a bad idea on a razor that shaved well or
almost well yesterday. It is OK in a honing contest but it is
not a good idea if you want to shave.

What it takes to...

Opinion follows:
For a finisher once it is flat enough never lap it again.
Use the rubbing stone to help keep it flat enough..

If the shave is not smooth enough hone with lather and rinse well...