Bummer, but glad you're going to be able to get it fixed easily. I just went through the process of disassembling, cleaning, and lubricating the entire system on my w201. Tedious, but not terribly difficult. The result was a wiper that now sweeps smoothly across the windshield.

Any w201 owner should do this as preventative maintenance. Honestly, I didn't until the wiper started slowing mid-swipe. I tried spraying the pivot points, but it's the inside mechanism that needs attention.