Master Cylinder Internal Arrangement Question

Executive decision after looking in service manuals etc. Even though the center hole in the retainer is larger than the piston stem this is how the books show it, like Old Man Mopar has it. I believe the cups gotta have spring tension against it or it would slide forward on each pedal return. After a closer look the teeth on the retainer never actually touch the rubber cup.
So, it's big end of spring in first then retainer then secondary piston, then primary piston. Got it bench bled and back in the car with some make shift nipples