From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint diagram illustrating a fracture on a lever near the Woodruff key.
| Identifier | ExFiles\Box 12\1\ 01-page110 | |
| Date | 21th November 1928 guessed | |
| LEVER BROKEN <---- TO AXLE CONTROL DAMPER ARROW INDICATES POSITION OF FRACTURE STRAIGHT THROUGH AND CLOSE TO WOODRUFF KEY. | ||