| Year | 1949 |
| Date | 21-Apr |
| Volume | 100 |
| Issue | 2,500 |
| Page | 478 |
| Category | In The Workshop |
| Part | 35 |
| Title | Additions to Machine Tools. (3) Attachments for increasing the speed range of the drilling machine |
| Author | "Duplex" |
| Notes | The Cowell drilling machine, adapting the Cowell Machine, the pulley bracket, the swing arm, machining the bore of the intermediate pulley, the pulley pivot, the pulley spindle, the jockey pulley mounting, the belts, adjusting the return spring tension |