| Year | 2020 |
| Date | 17-Jul |
| Volume | 225 |
| Issue | 4,643 |
| Page | 159 |
| Category | Workshop |
| Part | 2 |
| Title | Tempering and Gear Cutters |
| Author | Martin Gearing |
| Notes | Making Gear Cutters using a Button Formed Profile. Explains a foolproof method for tempering cutters. Nomenclature, size tables |