* 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
  * [[https://www.benzworld.org/threads/w123-300d-driveshaft-flex-disc-replacement.3162672/|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

==== parts ====
  * this is Kent's [[https://mercedessource.com/store/116-123-126-5-cylinder-turbo-diesel-driveline-flex-disk-kit|Flex disc kit]] but it doesn't say what brand the discs are?
  *