I think he is referring to this,
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1TN0SJ3D01XL03ND41&year=2000&make=MB&model=C-230-002&category=All&part=Wiper+Pivot+Assembly

It could also be a lack of lubrication on the external rods in this assembly. Search the forum for directions on cleaning and lubing. It's very easy to do.

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2012 E350 Bluetech