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It appears Dave reached the same conclusion I did in my page -- the "cap" or what Volvo calls a "casing" is there to keep water from entering where grease belongs.
Check out Jim J. Morris's Zen of Volvo 240 Wiper Linkage to which I have a link at the end. Jim describes a minimally invasive approach to the wiper drives. Obviously my photos would not have been so easy through the glove box and through the instrument cluster openings.
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Art Benstein near Baltimore
Long ago, when men cursed and beat the ground with sticks, it was called witchcraft. Today it's called golf.
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