Now set the sub assembly on it two feet.
Take the bench seat and center it on the rail / foot assembly.
How do you center the bench seat?
The ends should have about 4 inches of reveal and the sides should have about 1 inch of reveal.
Take a sliding T Square and measure each side.
If this is an open gap in the measurement of the T square, move the square in or out ½ of the gap.
Repeat this until each opposite side has the same equal measurement.
