| Year | 1990 |
| Date | 19-Jan |
| Volume | 164 |
| Issue | 3,865 |
| Page | 104 |
| Category | Workshop |
| Part | 8 |
| Title | Boring & Facing Head |
| Author | A.J.Lofquist (U.S.A.) |
| Notes | Describes the function and construction of a Self-Contained Boring and Facing Head. The facing ring 2nd operation, the retaining ring, the pawl, the cover plate |