| Year | 2021 |
| Date | 02-Jul |
| Volume | 227 |
| Issue | 4,668 |
| Page | 81 |
| Category | Workshop |
| Part | 4 |
| Title | Polygonal Holes & Rotary Broaching |
| Author | Jacques Maurel |
| Notes | Discusses the process of making non-circular holes. Rotary broaching attachment using rolling bearings, parts list, making, setting up, note about the XZN profile |