7-7 is huge here in TX. We never do a one-man mechanic though. Always 2 and at the state championships, we do 3. An "R" on the LOS right sideline counts the 4-second rule with a stopwatch, FS, ILF, spots on short gains, that kind of thing. A "Deep wing" on the other side of the field roughly 15 yards downfield or on any important line to gain(1st down line or goalline). He calls DPI, Holding, long spots. Then when we do 3-man we add a "B" in the middle of the field