I just rebuilt the spicer u-joint on my 29 Durant. I got the 16 replacement balls from Frank and found that I also needed four spacers too. The originals were all chewed up from banging together after the rubber balls were worn out and completely gone. It took me most of 1/2 a day to get it all put back together, but it made all the difference in the world. The only thing that the instructions didn't tell me was that the rear joint is held on with a bolt going into the transmission spindle. It took me awhile to figure that out. Good luck.