Paying my dues...
I rekeyed a tubular switch lock for an elevator company and the key was working fine. Problem was I left a spring out that pushes the contact to the positive and negative contact points. As I didn't know this it took a few minutes of examination to figure this one out.
Today I worked on a Simplex Unican lock that wasn't working properly. After taking it apart slowly and taking pictures of it and trying to figure out the parts. I figured the problem was a piece was worn out in the center thus making the lock malfunction. Using a piece from an old stripped down Simplex we had in the shop, I replaced the piece and it now works fine.
Also on some Trilogy locks a spring called a Torsion Spring will occasionally break and need replacement. The Simplex also has a similar spring.
After working with locks so often I am beginning to notice similarities in design and this does help me in troubleshooting some problems and figuring out how to put things back together.
There's nothing like experience and watching my coworker work helps me in a lot of ways. He sometimes does the impossible and makes it look easy.
Clh.