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).
Note with a photograph showing an off-side torque arm and spherical rubber after use.
| Identifier | ExFiles\Box 99\2\ scan0160 | |
| Date | 4th March 1938 guessed | |
| O.S. Torque Arm and spherical rubber after 1750 hrs. | ||