| Year | 2017 |
| Date | 31-Mar |
| Volume | 218 |
| Issue | 4,557 |
| Page | 527 |
| Category | Workshop |
| Part | 2 |
| Title | Making a Miniature Changeover Valve |
| Author | Dennis Stones |
| Notes | Deploys his experience in plastics engineering to make a potentially useful component part. Making the spool, making the valve body, machining the valve bore, reference |