The first thing we have to do is analyze the bite of the keys. Every keys bumps and ridge are called teeth. This is because they will fit into the mouth of the lock and make it speak. Analyzing this lets us pick a place where we would change.
Edit the Lock
Next, we match the teeth with the mouth and then decide with a section of the multiple tumblers and switches we should switch out. It could be as simple as making a switch and then edit the key…
Replace a Part
But often the easiest and most cost-effective way of making a rekeyed lock is to replace a single section of the lock. If you change even one small section of a lock and try the old key, it will not turn, and you risk breaking the key off.