I have read a few older posts but none addressed the finding an original datum. I have a 4' x 8' table that has a vertical arc on (Y) which is high in the center. It could be straight and slope down on one end, I dunno. But straight, it is not. The bearing rails are of the self supported round type. I am seeking suggestions for measuring/determining/indicating straight on the upper section/tangent of the the rail.

Thanks

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