The metal used is so weak that after bending it wasn't strong enough to exert any noticeable increased pressure on the window . I installed them on a Class 8 International 9400i Skyrise tractor. The window has very little flex and I used expensive one-piece wipers. However, the wipers flex so much that I just need a little more pressure from the passenger-side wiper arm. I bent them to a point that I thought would apply more pressure, but the metal just isn't strong enough to be effective. I came back with cheap $6 4 point wipers and that fixed the problem. I was hoping this product would work as advertised because the one piece curved wipers are so much stronger that on snow and ice they keep the snow off the windshield. It's a good idea and the ones I bought in the 80's were a lot stronger than these so they were very effective. I'd rather pay more and get a quality product.
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