| Year | 1936 |
| Date | 13-Feb |
| Volume | 74 |
| Issue | 1,814 |
| Page | 165 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | The "Eta" Lathe Clasp Nut Handle |
| Author | G.E.Coupland |
| Notes | Horixontal section through apron at centre of cam disc, back of apron showing lever in engaged position |