Get the wiper arm to stop in the middle of the window. Now remove the plastic cover by pulling out. Move arm so its at top of arc and wipe the metal slide off. Then apply several drops of automatic transmission fluid and work the arm back and forth. Finally, put several more drops on the arm, reattach the plastic cover and off you go. If you dont keep the arm lubed this way, you will be spending $1200 for a new mechanism.