for lapping anything i use a true flat thick piece of glass or metal (checked with a straight edge) then tape some wet dry auto paper on it and go to town. 500,1000,1500,2000. i make sure i keep it clean, no zippers, little granulars in the paper or under it. you will feel them if they are there. i use a straight edge on whatever i am lapping against light to check for flatness. if it has any highs or lows light will shine through..



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