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).
Diagram of a spring-loaded starter pinion engaging with a flywheel gear.
| Identifier | WestWitteringFiles\T\January1929-February1929\ Scan172 | |
| Date | 12th February 1929 guessed | |
| (2) About 1 1/2". Flywheel gear. This gear has cork faced spring loaded driving surface with slip if any excessive shock. On colliding with flywheel gear this pinion can slide back until gears mesh. | ||