My wipers have a 70deg sweep? They are not horizontal when off and not vertical at full sweep. I took motor assy out to inspect and motor rotates 360 of course and all bushings are tight. it is completely silent when running. Been told my arms are not bolted to shafts correctly. Well, then, if they were too high at close, then they would sweep off windshield. But that is not the issue. Any ideas?