Quote:
Originally Posted by darkmoon87
yeah my fault for a vague explanation, but once i get the picture up you will know what i am talking about. gave me cringes after finding it out 
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Don't cringe, just think carefully about how that upper mount works. Most of the time (I dare say 99% of the time, as even those of us who do motorsports very rarely ever "get air" with the front of the car), the weight of the car is holding the upper strut mount into a tightly fit sort of conically-shaped hole in the strut tower. It ain't going anywhere, even if you didn't put the nut on the end of the strut! (might make a little thunk when you hit a good sized bump, but that's about it)
The nut on the end of the strut is there merely to support the weight of that strut, hub and wheel assembly when the suspension is in full droop. It's more than up to that task.
It's a brilliantly simple design, really. It's that kind of reduced-part-count and easy-to-assemble engineering that allows them to sell the Yaris for a relatively cheap price.