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).
A modification to hover arm bearings after a certain number of hours.
| Identifier | ExFiles\Box 99\2\ scan0168 | |
| Date | 4th March 1938 guessed | |
| hower arm bearings after 1750 hrs Inlox bearing has a radius on the end of inner tube | ||