To do it, first of all take off the wipers, and then push the wiper to vertical, at the same time hold the wiper retaining nut cover and bend the arm and cover towards the windshield to lift the cover and see the nut. The second one is pull the arm off, untighten the washer and nut, and label the arm with the spindle. Installation If the nut is to be removed, removal must be succeeded by tightening it.