Listen-In Video Lesson | Keying Schematics 

Very nice and professional presentation! Thank you for sharing!

Is there effectively any difference in the X1X designation and the older term "Maison Keying"? (Other than the fact that Maison keying used to be for the front of buildings or large boarding houses, now considered insecure) Is it only officially Maison keying if *all* of the change keys work, without exception? EDIT: ah, you seem to clarify this later in the video 😉👍

20:22 Why. ot give the intern one of the unintended keys that would also work in that lock? There must be hundreds of candidates.

Wow that's not a key schematics that's a building schematic... Mgr needs all keys boss isn't gonna touch our peasant brass 🤣