Okay, I have read your spring theory, and am about to head to the ga-rage with a wrench and tape measure. Three turns in each direction from OEM factory, and start jumping up and down on the bumper while my kid records the results...

(In fact, I was thinking about how to video tape this experiment, and make it more interesting. Maybe in the parking lot of Hooters, using three or four waitresses for the counter weight? Anyway...I digress...)

I lived in Missouri for awhile...in this case, I gotta show me.