I have my Table assembly level-square-parallel. So I tightened eveything up to that point. When I went to install the X rail on the table side rails I noticed that X rail were the same length, but did not match up to the side rail length. So I checked the side rail length and one was 5/16 of an inch longer than the other. I know now that my square is not true because the two side rails were not the same length when the diagonal measurents were taken. My ? is I would assune that the most important diagonal square point would be from the corners of the X rails, so should I loosen up bolts and resquare from the X rail points? Just checking to see if my assumption is on the right track. Thanks for any help!!!!!