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).
Which springs should be used and which should be left out.
| Identifier | ExFiles\Box 5\3\ 03-page029 | |
| Date | 10th February 1921 guessed | |
| The sixteen 16 driving Springs should be left out and damping Springs GB 5324+ should be used | ||