There are 2 types of warding used in this lock. The first is provided by a floating disk located just behind wafer 1 ( Illustration 5 ) and is used to control which keys fit into the lock. There seem to be 2 types of keys for this lock, corresponding to the 2 ways the disk can be placed in the lock. The one free spinning wafer is essentially the only thing that keeps different key profiles from entering the lock. The internals are relatively agnostic as to which of the 2 profiles is used. This is likely done to reduce manufacturing costs. The key fits through the wafer as in Illustration 6 .

Illustration 5 Face removed Illustration 6 Disk on key

Other warding

The second type of warding is provided by wafers. Some wafers such as 4, 5, and 6 allow the key to rotate whether or not there is a cut in the key. Other wafers like 3 and 8 only let the key turn if material has been cut away at that level. As long as a key doesn't have material sticking out where the wards are, it can turn ( Illustration 7 ). Different "bittings" for keys are made by switching around which kind of disk is at each layer.