Mike, forgive me for putting corrections here instead of e-mailing them. I don't have access to e-mail throughout most of the day and this is a better place for me. If you'd like it better, I could PM them, or if you insist, I'll e-mail them (that will just be very inconvenient for me).
In the "Building the Bulletproof Transmission, Secrets of the Pros" article, you have this on page 4.
On the B15 transmission, the reverse idler gear stays meshed with the main shaft and rides in bearings on a thick shaft supported on both ends. The gear helps prevent the main shaft from moving. On an older Sentra tranny the reverse gear idler is not engaged unless the car is in reverse and the idler is a wimpy thing supported only on one end. It has no support function at all.
Link: <a href="http://www.motoiq.com/MagazineArticles/tabid/59/articleType/ArticleView/articleId/839/PageID/932/Building-the-Bulletproof-Transmission-Secrets-of-the-Pros.aspx">www.motoiq.com/MagazineArticles/tab...-Pros.aspx</a>
I've put in bold the incorrect information. Everything else is factual.
The shaft that holds the reverse idler gear in place is obviously supported on one end where it has the notch taken out of it. The other end is supported by a provision in the transmission case easily seen in this picture: <img src='http://motoiq.smugmug.com/photos/525110953_xfb5X-M.jpg' />
It is directly to the right of the opening for the counter shaft bearing.
Not a typo or grammatical issue, I know. But something I thought needed correcting anyway.