I spread the rear wiper arm flange with heavy duty needle nose pliers. I firmly held the arm with one hand while using the other hand to bend the flange with pliers. The metal was very stiff and a little knob thingy prevented grabbing right at the hinge, but I could bend both sides enough that the spring tension now keeps the blade firmly against the window when wiping. I didn't have to bend much, just enough to stop the binding at the hinge. It left a few scratch marks but not very noticeable, which I suppose a little electrician tape on the plier jaws or/and arm flange might have prevented the marks. The wiper now works like it should. Some quality bike chain lube on the hinge for good measure will help keep it working smooth.