Rear Windshield Wiper doesn't touch window

[navin in KC]

My rear wiper motor works fine, but when the wiper runs, the wiper doesn't even touch the window. the metal spring in the wiper is intact, but the "hinge" that allows the wiper to be pulled away from the glass is very tight, which doesn't allow the wiper hinge against the glass while it runs.

I suppose WD-40 is where I can start, but I thought I'd ask to see if anyone had similar problems and/or a solution.

thanks.