and a damaged arm will not properly move the wiper across the windshield. Also, you may have to remove the arm while performing maintenance on the other parts of the system, such as
Remove the nut, using a ratchet and socket . Rock the wiper arm with firm but gentle force while prying the base of the arm off of the splined wiper-arm stud. The wiper arm may be corroded in place and tough to remove, but the combination of firm rocking and prying with the screwdriv...