Flex Disc issues thread
 

Bad Flex Disc
http://www.peachparts.com/shopforum/diesel-discussion/121285-bad-flex-disc.html#post868326

Weekend Wrenching (a great picture of a bad flex disc)
http://www.peachparts.com/shopforum/showthread.php?t=216701

The Death of a Flex Disc ... did I kill my 240D?
http://www.peachparts.com/shopforum/diesel-discussion/252017-death-flex-disc-did-i-kill-my-240d.html#post2194084

What happens when you ignore that "little" driveline vibration!
http://www.peachparts.com/shopforum/vintage-mercedes-forum/205055-what-happens-when-you-ignore-little-driveline-vibration.html

Flex Disc Orientation, safety and durability issue.
http://www.peachparts.com/shopforum/tech-help/235575-flex-disc-orientation-safety-durability-issue.html

If your W123 is shaking down the highway. . .
http://www.peachparts.com/shopforum/diesel-discussion/223050-if-your-w123-shaking-down-highway.html

Correct way to install front driveshaft guibo? (FLEX DISC)
http://www.peachparts.com/shopforum/diesel-discussion/187593-correct-way-install-front-driveshaft-guibo.html