Maybe one of the editors of the mag or a regular reader can tell you if there has been a tut on pin backs.
I do know all the major silversmithing supply houses carry pin catches, pin stems and pin hinges in nickel silver and some in sterling that you can torch solder on. The advantages are that the pin stem is sharp and the pin hinge works well. If you really want to make you own pin hinge using sterling tubing (chenier) here are some books that have instructions:
The Complete Metalsmith by Tim McCreight.
Jewelery concepts and Techniques by Oppi Untrach.
The Encyclopedia of Jewelry Making Techniques by Jinks McGrath.
Indian Jewelry Making by OT Branson.
Hinges and Hinge-Based Catches for Jewelers and Goldsmiths by Charles Lewton-Brain.
Some of these books may be available at your local library, book store or bead store.
Ganoksin Orchid forum has some articles that may help: http://www.ganoksin.com/borisat/nenam/other-hinge.htm
http://www.ganoksin.com/borisat/directory/library/subject/18/1