OK, not sure what happened here...but everybody get back in your seats and quiet down...
...we're just trying to help, here
Are you saying the throttle return spring is the rusty, external one in your pics?? I have not seen that before. The throttle return spring is usually a coiled spring wrapped around the butterfly on the carb..not something external.
It should be attached to the part that rotates when you open the throttle. I can kind of see what should be the return spring in your pics..
See my attached pic with yellow arrow...is that not a spring?
I don't know what the heck that old rusty, screen door closer spring is...