| Year | 1987 |
| Date | 17-Jul |
| Volume | 159 |
| Issue | 3,805 |
| Page | 90 |
| Category | Workshop |
| Part | 12 |
| Title | Spring Design and Manufacture |
| Author | Tubal Cain (T.D.Walshaw) |
| Notes | The flat (spiral) torsion spring, torsion-bar springs, example, the concentric torsion bar, odds and ends |