| Year | 2020 |
| Date | 03-Jul |
| Volume | 225 |
| Issue | 4,642 |
| Page | 73 |
| Category | Workshop |
| Part | 1 |
| Title | Tempering and Gear Cutters |
| Author | Martin Gearing |
| Notes | Explains a foolproof method for tempering cutters. Introduction, tempering after hardening with guaranteed results |