I'm trying to help out a neighbor with his 90 300D. It looks like the head on his mono wiper is out of wack. The in out won't stay timed with side to side. I read the article at MBZ.org http://electric.mbzarticles.org/wipers/ but this head doesn't have clips holding it together instead there is one all but inaccessable screw. Does anyone have some information on disassembly or replacement.

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Bob D.
Parrish, FL
1 SDL, 1 D, 1 TD, 1 Mog