Originally Posted by Supramk3
The wiper arm doesnt quite sit parallel to the windshield at the cowl, it is angled up just.slighty which doesnt put enough pressure on the blade at the connection point on the wipere. So with the oe specific numbers, they are corrected for this. Being as the wiperes, swipe in opposing directions. Just wanted to share my findings. :)
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thanks! great info, I wish the arms were aligned properly so the factory blades didnt have to be 'corrected'. Thanks Ford.