| Year | 2015 |
| Date | 03-Apr |
| Volume | 214 |
| Issue | 4,505 |
| Page | 505 |
| Category | Road Locomotive |
| Part | |
| Title | Worm Wheel and Worm Design and Manufacture |
| Author | Andrew Johnston |
| Notes | Describes his use of CNC to perform a complex piece of machining. Design of the worm and worm wheel, machining of the worm |