Breadboard of Knife Mechanism
This breadboard was developed to explain how the knife handle, molded low density neoprene, changes shape. As the adjustment knob is turned the screw type device shortens the knife length, thus compressing the handle, and causing the material to widen in diameter.
Final Model

This is the knife in it's thinnest adjustment intended for more control where precision cutting is required.
The knife is adjusted by rotating the knob at the top of the knife. This drives a screw type mechanism, which compresses the specially molded low density neoprene, which is forced to expand.

The knife in it's fattest setting is ideal for cutting where more pressure is required. This setting is also advantageous to people with arthritis, who prefer a larger grip.