David, that did it, and it worked immediately! You're a gentleman and scholar, and there are damn few of us left. Thanks very much!
rberry65, you should try this. I was unsure exactly where to squirt the fluid, but I think where it was needed was the cluster of black gears that has a little scythe-shaped piece arcing around them.
elcabezagrande, I also followed your advice and replaced the deteriorated front mirror bumper foam with some I cut from a 35mm film cassette.