I did R&R on the radius ball on my '29 Tudor a year or so ago. It had one of the after-market rubber sleeve caps on it, and I replaced it with a stock-style version with one of the extra washers. You can find the report with many pictures at my club's website
http://www.cedarcreekas.org/TechTopi...sBallRandR.pdf
The pictures show the cast iron socket that holds the rubber sleeve and radius ball, and also the stock version. There is a LOT of difference.
IMHO, post 1 in this thread shows the cast iron caps, improperly assembled. (There weren't any springs in the assembly on my Tudor.)