Oh dear. Some of the folk can get caught out from time to time.
Much simpler, but in a similar vein. Years ago, following a major rebuild of a bent bird, I was whistled up by the shop to do a reweigh. Quick walk around (as I do) before we started. "Where are the leveling lugs ?" sez I.
Embarrassing when you forget (or don't bother) to check the drawings and leave bits off during a rebuild .... I still wonder what else was left off and whether they talked someone else into doing a "turn-a-blind-eye" reweigh.