Carter BBD confusion

in thinking about this. a carburetor that stayed closed and would not relax open would have the same problem. you would be pressing on the gas pedal and it would fall to the floor. you would turn off the car or pull the pedal back with you foot if you could. only time it would ever be a problem is if the car were idling and you ran into the store. the spring would breake or come of and the throttle would relax. then the rpms would raise wide open and could possibly blow up the motor. it is a long shot but damn ive seen some stuff happen.
maybe that spring on top of the diaphragm should have been just placed on the bottom of it pushing the diaphragm up instead. i have not had mine apart yet. but the exploded view shows 2 springs. one on bottom and one on top. i wonder if the carburetor actually does have one on the bottom. and i wonder if if doesnt....could it be put there instead of the top.