Morning Charlie, Humm, I'm having a hard time finding something to blame for taking out that center support besides myself for using a Febi made in China and I ordered two of them, one for a spare, doh. Yah, maybe one from one of my parts cars would last longer, I'd try it if it wasn't such a hassle to get. That "notche detent" was the only wrinkle I could think of. I like the idea of a grease fitting in the U joint, my DS between tractor and mower has them. Maybe something will come to light when i look under there but it feels just it did before, same vibration.
Have a nice day and enjoy the sunshine.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"