[EricH]

Did you also look at the tolerance statement in the Manual?

The competition ARENAS are modular constructions that are assembled, used, disassembled, and shipped many times during the competition season. They may undergo a significant amount of wear and tear. The ARENA is designed to withstand rigorous play and frequent shipping, and every effort is made to ensure that the ARENAS are as identical from event to event as possible. However, as the ARENAS are assembled in different venues by different event staff, some small variations do occur. Fit and tolerance on large assemblies (e.g. the TOWER) are ensured only to within 1/4 inch. Overall gross dimensions of the entire field may vary up to 4 inches. Successful TEAMS will design ROBOTS that are insensitive to these variations.

In other words, you can expect it to be +-1/4" or so on any one peg (large assembly). Plan accordingly.