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wrote:

The indicator base was placed on the column in order to eliminate any
possible movement of the wheelhead. The measurement does therefore
confirm the flatness of the table which translates into the
straightness of the ways.

Consider if you removed the entire table and way assembly and instead mounted a
bicycle wheel below your indicator. Then turned your bicycle wheel and adjusted
it until the meter read zero deflection. Would you then assert the bicycle rim
is flat?

GWE