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I've often considered using the curb for my #120 pro and #220 glass. They dip so fast anyway that I feel it is a waste of lapping plate and/or lapping compound. The 500 is pretty soft, too but it can...

Actually the DGLP is a 325/375 mesh, so it can lap as low as 500 grit, making the #220 the only stone in the glass series that is pretty much useless. The DRLP is the 1K and higher limit....