I have worked on putting that system up for three matches, (HOLTON) and I can tell you, you would need a dial caliber to measure the right to left. The upright posts are threaded in and tightened on a concrete pad that is 2 ft deep and about 18" across. And the right to left don't mean S___T. Again I repeat it is not the system I would put in, but it is "SOLID" like a rock.
Now I have to use Spell check all the time, what is this world coming too, EH!!!