Thanks Benzmac and MBenz!
You will recall that our C-220 was suffering from an agonizingly slow wiper motion.
Per your advice, I removed the small cover and the wiper arm. I then positioned the wiper in the vertical position and pulled the shaft to its extended position and lubricated it with a couple of drops of 3-in-1 oil and moved it up and down. Magic! All hesitation in the wiping action is gone.
I strongly recommend that everyone with the single wiper blade perform this simple procedure to prevent this problem from occurring. It makes driving in rain or snow or road spray more than a little dangerous.
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe