| Year | 2001 |
| Date | 01-Jun |
| Volume | 186 |
| Issue | 4,147 |
| Page | 546 |
| Category | Road Steam |
| Part | 16 |
| Title | Savage's Little Samson in 3in., 4in. (and other) Scales |
| Author | Martin Wallis |
| Notes | Differential unit, describes techniques for obtaining or making bevel gears and pinions. Expert advice, supplier, commercial gear cutting, cast gears, off the shelf, cut them yourself |