| Year | 2012 |
| Date | 10-Aug |
| Volume | 209 |
| Issue | 4,436 |
| Page | 220 |
| Category | Workshop |
| Part | 2 |
| Title | Self Centering Caliper Knurling Tool |
| Author | Keith Johnson |
| Notes | Designs and builds a simple tool. Cutting a slot, spring centering items, the plunger body, adjusting items, adjusting nut, the guide bush, the adjusting screw, the plate spacers |