When you buy a WDH from Harbor Freight, you don't get tremendous precision. 1/2 inch difference in the torsion bars is probably to be expected.
It's difficult to tell if the two bars bend equally for a given force. I suspect there is a twist around the long axis of the vehicle and trailer inherent in most WDH systems. The Harbor Freight unit might be worse than others in this regard, since you can see the difference between two bars.
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