| Year | 1977 |
| Date | 19-Aug |
| Volume | 143 |
| Issue | 3,567 |
| Page | 945 |
| Category | Workshop |
| Part | 2 |
| Title | Setting-Up Aids |
| Author | George Thomas |
| Notes | Edge finder, notes and comments on the drill jig, "finger" plate, accuracy and tests, sources of error, varying spring pressure |