| Year | 2000 |
| Date | 14-Jan |
| Volume | 184 |
| Issue | 4,111 |
| Page | 101 |
| Category | Optical |
| Part | 3 |
| Title | An Optical Comparator for the Home Workshop |
| Author | Richard E.Butterick (Canada) |
| Notes | Completes the design. Reticle, friction wheels, protractor wheels, mirror retainers, lens mount, protractor and bezel rings, templates, work stage |