| Year | 1979 |
| Date | 15-Jun |
| Volume | 145 |
| Issue | 3,611 |
| Page | 692 |
| Category | Workshop |
| Part | 6 |
| Title | A Versatile Dividing Head |
| Author | Geo.H.Thomas |
| Notes | Making the worm and plate attachment, sector arms or fingers, sector spring, micro adjustment wheel, worm spindle bearing sleeve, worm shaft |