I don't think they were trying to replicate it exactly, and were given vague and contradictory advice. Even rereading that section about having a switch to tur

I don't think they were trying to replicate it exactly, and were given vague and contradictory advice. Even rereading that section about having a switch to turn from hot to cold, never warm makes no sense to me. Unless you want a single-pole double throw knob, and have the mother of all water-hammer any time you change the temperature.