Correl, I understand your argument is that the bottom part of the hub is not engineered to be the point of most of the force transfer. However, consider the following along with the other excellent points people have brought up above:
* The widely used Cortina upright looks flimsy in comparison with the Sierra design.
* Sierra parts have been the mainstay of the kit car industry for many years, no problems of uprights failing being reported.
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