| Year | 1989 |
| Date | 06-Oct |
| Volume | 163 |
| Issue | 3,858 |
| Page | 420 |
| Category | Workshop |
| Part | 4 |
| Title | Hardness Tester |
| Author | Dave Lammas |
| Notes | Describes the function and building of an instrument for the home workshop. Lever link, weight bridle, specimen elevating screw, the circular nut |