Ron,
I'm not familiar with an article about it, but it is a fairly simple procedure, and the results are incredible. First, you need to obtain a 60 degree live center to be mounted on the tailstock, then a 60 degree dead center for the headstock. Once that is done, all you need to do for pens other than slimline is to slide the bushings into the tubes for either the top or lower section of the pen. Then, put the hole in the center of the bushing flush against the dead center, bring the tailstock up so that the live center is inserted into the center hole of the other bushing, tightten the headstock and start turning. This works great fro Jr. Gents, Barons, Sedonas, etc.
Also, there are bushings that are made exclusively for center 2 center turning taht are made to much more exacting standards than the regular bushings. Less clearance inside the tube, larger outside bushing area, and the ends are machined to a 60 degree angle for the dead and live centers to be perfectly aligned. No holes in the bushings, so they can never be used on a mandrel, but once you try this, you will want to throw your mandrel away. Until this year, JohnnyCNC was making these bushings, be he lost everything in a flood this summer. Now, check the following link for more informatuion on bushing avaliability:
http://www.penturners.org/forum/showthread.php?t=37433&highlight=bushings
Good Luck,
Dan