| Year | 2006 |
| Date | 27-Oct |
| Volume | 197 |
| Issue | 4,285 |
| Page | 493 |
| Category | Workshop |
| Part | |
| Title | How to Drill Square Holes |
| Author | Jacques Maurel (France) |
| Notes | Reveals how to make the tools. Reuleaux triangle, making, making the drill bit, making the square bore guide, floating tool holder, main parts list, adjustments, tool fixing, machining a square hole |