Evan wrote:spandexwarrior has covered the gist of it...
perhaps if you asked the specific question about the type of locks you are working on and whether you are using a documented OEM master keying system chart or one that has been provided in the field...
~~ Evan
Actually, I'm working on more of a theoretical level, honing my general knowledge. Definitely no charts or anything.
Wish I had become an apprentice before I fell into a career and a mortgage. But alas, will learn as a hobby instead of a profession.