| Year | 1975 |
| Date | 07-Mar |
| Volume | 141 |
| Issue | 3,508 |
| Page | 227 |
| Category | Workshop |
| Part | |
| Title | Tap Grinding on the "Quorn" |
| Author | Wm.M.Thomas |
| Notes | The rake angle, the importance of rake and flute form (with acknowledgements to Galtona), extra equipment required, method |