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).
List of notes on modifications for gear lever centralising springs and servo components.
| Identifier | ExFiles\Box 94\1\ scan0192 | |
| Date | 17th September 1935 | |
| -2- Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}19/KW.17.9.35. (15) Weaker gear lever centralising springs to Hdy.{William Hardy}1/HP.18.6.35. (16) Disc type servo damper N.Sch.4428. (17) N.Sch.4606, Fig.1, to cure servo stop foul. Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||