Well I was out there in Windsor Saturday. Snagged that 717.411 from the 300e. The driveline was badly buggered so not a go for that. I got a balancing disc off the driveline. It bolts in with the front flex disc. Its made of a metal brace connected to a rubber disc. I plan to use it on the 717.400. I hope it works.
As for the 717.411 it may be a research project.

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Chris
84 280sl
82 300d euro