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).
Draft note discussing different key types, sketches, and various mechanical components.
| Identifier | ExFiles\Box 181\M7\ img006 | |
| Date | 1st April 1924 guessed | |
| A W Bently Coupling You state in your letter unsuitable without the close fitting key. There is another type which might be tried if it would suit you better to send rough as sketch Tight enough to hold for general use (telephone) Lose Key for safety. Top of universal jaw - m ends of bushes. odd sums Equal motion constant pedal 3qrs 3 percent | ||