Years ago I wrote a short paper on this joint. I can't find a copy, but it is in one of my books and you can see it at this site. It is a preview and you don't have to buy the book to read it. This subject is on page 28 and I hope this site will bring it up for you.
http://www.blurb.com/books/2102520-m...tips-and-hints
If not, go to blurb.com, search for "Model A Tips and hints", go to the preview, find pg. 28 and enlarge it so you can read it.