When I did mine, like 8 of the 12 were all right in the middle. 2 were like 5 thousands off and 2 were on the ragged edge, just barely in spec. If I do it again, I will make up a T square equal to the bottom tolerance. Then use a feeler gauge to see how far off the bottom I sit. The biggest issue was I needed like 4 hands to hold everything in place while I measured.
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