| Year | 1998 |
| Date | 24-Apr |
| Volume | 180 |
| Issue | 4,066 |
| Page | 499 |
| Category | Workshop |
| Part | 1 |
| Title | David & Goliath (Boring heads) |
| Author | Dr. John Beddard |
| Notes | Describes two piston slide type boring heads. Castings from Hemingway. Photographs by S.J.Curtis. Evolution, Goliath's body, boring the casting |