• https://www.benzworld.org/threads/another-u-joint-driveshaft-thread.1581728/
• https://www.peachparts.com/shopforum/diesel-discussion/293976-drive-shaft-u-joint-staked-crimped-place-now-what-do-2.html
• https://www.peachparts.com/shopforum/diesel-discussion/250486-how-replace-driveshaft-support-carrier-bearing-step-step-guide-3.html#post2575372
• https://www.peachparts.com/shopforum/diesel-discussion/339345-w123-driveshaft-service.html
• Flex disc replacement talks about a center bearing/bushing that could be replaced
  • this is worth spending some time on as if it is warn it might cause vibration and also there's a rubber seal keeping dirt out of it which must be worn

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