I'm "up to my fetlocks" in a WNW Bristol F2B Build for the Two Seater Group Build and have a quick question: what is the lever assembly to the right side of the rear fuel tank? (Which the pilot's seat is mounted to) It's part A13 and sort of looks like a parking or emergency brake handle on a car. I'm guessing anything from an adjustment for the stabilator assembly to some sort of control lock, can't figure it out from any of the considerable references on and off line, and I'm the curious sort.Any Bif experts out there?Cheers,Lance