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Lapping a plate perfectly flat is not critical. For a long time I used an un-lapped fairly flat ceramic tile. You could clearly see wear on the film where it was not making complete contact, yet I...

Lowes is now selling Lapping Film Float Glass plates.

Just under 3 in X 12 in X 1/4 in plates, found in the tile section.

They are not dead flat as often said of float glass, but a 325 or 600...