| Year | 2020 |
| Date | 19-Jun |
| Volume | 225 |
| Issue | 4,641 |
| Page | 34 |
| Category | Workshop |
| Part | |
| Title | In Praise of the TDI (thread dial indicator) |
| Author | Jacques Maurel |
| Notes | Explains the merits of the thread dial indicator and shows how you can make your own. Why? How it works, using the TDI with sub-multiple pitches, making your own TDI, reference |