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+1 to all of the above but make sure you lap it in the sink under running water. Protects the plate by washing the swarf away. If it builds up it can wear the plate and can cause an uneven surface on...

Another vote for the 8" plate. The continuous plate, not the waffled one. For lapping the big Norton that is what you need. Some day you may get a good sized chip to take out of an edge and you'll be...