The other thing to add here is WB base-plate flatness variations. Unless Joe is testing the same block as Bill did, there are bound to be some variations here. BillA's review showed that the flatness on the block that he reviewed could be improved and he makes mention of this in his review of it.
Bill has pointed out many times that block makers should all find themselves access to a proper lapping machine. I'm still hunting for one in my area that doesn't cost an arm and a leg.
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