If you need help with this lock, maybe there is someone in your area who could help you. What is the name of the locksmith shop you work at? City? State? Often times the best answer to a problem like this is for someone to show you how to do it. But, like others say, it would be much easier to help you if we knew the make and model of the lock. But your a locksmith, so you have access to all the product catologs and such, so it shouldn't be hard for you to tell us exactly which lock you are talking about. You also, in your locksmith shop, probobly have some key code equipment, if you could give us the depths of the key cuts that might tell us some problems your having (ie high cuts next to low cuts).
Oh, by the way, nice interests...
Electronics, Lockpikcing and other criminal acts, LOL