Designo,

I've been able to trace down the exact reason this happens on the 2000+ 210's but haven't been able to figure out a way to correct it. If you're interested I can attach or send you some pics of mine dismantled and show you why this happens.

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86 Nissan 720 P/U - 285K miles and counting!!
91 Volvo 240 - 218K miles and still going strong.
00 Mercedes E320 - 111K miles and lovin it!!!