| Year | 2017 |
| Date | 28-Apr |
| Volume | 218 |
| Issue | 4,559 |
| Page | 634 |
| Category | Workshop |
| Part | 3 |
| Title | Making a Miniature Changeover Valve |
| Author | Dennis Stones |
| Notes | Deploys his experience in plastics engineering to make a potentially useful component part. Drilling the valve ports, deburring |