I have searched but cannot seem to find what I am looking for.
I am building a 48x96 router table. I have the X axis are to long axis. I am having a hard time trying to figure out how to level the top bar, 1/2" x 3" wide to be as close to straight as possible.

A string is too thick to see with and a 4 foot level shows gaps from one end to the other on the level. I know how to shim it, but what to use for a straight line or straight edge for the whole 10 ft length of the axis?

TIA

Gary

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