| Year | 1999 |
| Date | 17-Dec |
| Volume | 183 |
| Issue | 4,109 |
| Page | 762 |
| Category | Pete's Page |
| Part | |
| Title | Case Hardening |
| Author | Peter Spenlove-Spenlove |
| Notes | Recalls an aspect of his apprenticeship. Contained stress, case hardening, carbon powder and blowtorch, pack hardening, cyanide hardening, heat treatment, quenching technique, localising the treatment, find an expert |