As we've previously told you, having a master lock system is a huge benefit to you as a landlord. Locks like the Kwikset SmartKey lock now allow for you to re-key the lock without removing the cylinder! This is a huge time saver and makes it well worth the investment into these kinds of locks! Below are 4 pictures showing an example of how the Kwikset SmartKey locks work. At first glance, the lock appears no different than any other deadbolt. However a small hole allows for the front plate to spin 180 degrees, covering the resident key hole and exposing another key hole. This second hole, shown in.