THX a lot Kurt and Ruth!!!
I bought my 1929 Phaeton 3 month ago and thought it was a bargain. And I was right. But the bargain was for the seller only. Everytime I do something on the Phaeton, I discover a new problem. Unfortunately, there is a great lack of know how here in Germany for the Model A. But Luckily, the Internet build a bridge to you guys.
At first I was puzzled because of the part (inner cap) that shall be missing. After I have found it in my Snyder's catalog with the note "not available", I searched the Internet for a shopping source (unfortunately no junkyards for Model a in Europe). I did not found one yet, but by the way I solved the problem of my Universal Joint Housing Cap, where the two upper side holes don't match with the Main Shaft Bearing Retainer holes. I already drilled them out to long holes in the UJ Housing Cap, so I'm able to fix it together with smaller screws, but still wondered about this not fitting crap. Now -with you set me on this trail- I found out, that and why Henry build different Universal Joint Housing Caps.
Additional thanks to Steve C. Plucker and his U-joint study. Very interesting and helpful!
If you know anyone, who sells an inner cap please let me know. I would change the Universal Joint Housing Cap to the equal hole version too, if the source would be the same (high shipping rates).