I'm going to lubricate all the contact points in my windshield washer arms with wheel bearing Grease. I changed the rubber inserts, but the arm does not Flex at all the metals to metal contact points, and the rubber is not getting pushed against the windshield at all points of contact between the rubber and the windshield.
A long time ago we called the rubber inserts "windshield washer blades". If you go into an auto parts store now and ask for a windshield washer blade, they will hand you the entire arm. I guess they like to sell the entire mechanism. I don't see the point of buying the whole doggoned thing, when you can replace only the rubber.