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 design modifications and their status for the 20/25 HP Chassis.
| Identifier | ExFiles\Box 30\4\ Scan155 | |
| Date | 30th April 1934 guessed | |
| (1) 20/25 HP. CHASSIS. ITEM. DESIGN POSITION. ------------------------------------------------------------------------ Modification to larger oil filler. Completed. Controls for 1 1/4" Horizontal Carburetter. Completed. Modifications to 1 1/2" Horizontal carburetter. Completed. Modification to valve rocker arms. Completed. Engine anchorage stays - Exp.rear rubber engine mounting. Completed. Rubber rear engine mounting - scheme suitable for production. In hand. Foot switch for head lamp control. In hand. Modification to breather pipe - Air silencer to rocker cover. In hand. Mounting of Klaxon windscreen wiper motor on dashboard. In hand. Centrally mounted radiator. In hand. Stop to limit compression of damper bellows. Completed. Modification to shock dampers to avoid the use of elbows. Completed. Cantilever pedal mounting - to suit flexible engine suspension. In hand. Preliminary investigation into fitting J.3. type box into 20/25 HP. chassis. Completed. | ||