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Smooth???? Flat is the key....!!!!

The goal of lapping is to get the surface flat.... so the first question
is will you get it flat.

If it is not smooth enough you can use a finer paper....

Close enough....
If you have 280 use it as long as you have a flat surface.
In fact after a coarse paper you can use a finer paper to
lightly finish the surface and make it a bit smoother. Do...