| Year | 1989 |
| Date | 07-Jul |
| Volume | 163 |
| Issue | 3,852 |
| Page | 32 |
| Category | Workshop |
| Part | 1 |
| Title | Hardness Tester |
| Author | Dave Lammas |
| Notes | Describes the function and building of an instrument for the home workshop. Meaning of hardness, industrial tests, comparative results, castings from M.J. Engineering |