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This not a weenie machine and 4 thou seems so huge.Pics would help. If its a knee mill, my first thought is the knee gib is loose.
I generally just bring the table up until the ends of the dial indicator touch , zero them out and lower the table. Check for differences
... a sheet of glass will suffice ..........or at least get you very close - you can always rotate the sheet of glass to see if any anomaly is the machine or glass itself.
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