I will give the tire rotation a shot. Discount tire loves doing stuff like that, and a much cheaper possible solution then a new driveshaft.

Both flex discs are new Lemforder. The old ones, after close inspection, did not show the obvious signs of wear commonly mentioned in this forum.
I will take a look at the included threads a little later, thanks for including them.

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Mercury is a boxer

1984 300d
1999 Prelude
Medici road bike
Klein touring bike
Klein mtn bike