Front disc conversion on '65 Barracuda FS

Because the adjustment was engineered into the system. It doesn't need to be adjustable given the design of the entire vehicle.
That makes good sense Rusty. I'd like to use a non-adjustable factory dual circuit type, but I think they all incorporated the light switch, trying to get away from that on this car. I may have to stick with an adjustable type like Inline tube recommends and just plumb it in.