by Romstar » 4 Apr 2005 16:04
Books that you may find useful are:
"Interchangable Cores: Small Format" by William M. Lynk
Don O'Shall's excellent book: "Guide to Interchangable Core Cylinders".
There are other books on masterkeying, but gernerally any good course on locksmithing will cover the basics you will need.
Some software that will make the job easier is ProMaster 5 by WH Software and Masterking by HPC.
I will see if I can find anything else that could help you out.
Romstar