[EricH]

Originally Posted by Andrew Schreiber

Even then. Fields do vary. My personal favorite was in 08 when the overpass started to sag.

Expect up to a 4" tolerance in overall field dimensions, and 1/4" in any given assembly. IIRC, that's what the manual states, or close to it. If you need it to be within 1/8", you don't have enough leeway.