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).
Hand-drawn graph tracking complaints of clutch jagger against the number of complete units and centre plates changed.
| Identifier | ExFiles\Box 131\2\ scan0208 | |
| Date | 2nd May 1938 guessed | |
| COMPLAINTS OF CLUTCH JAGGER COMPLETE UNIT CHANGED CENTRE PLATE CHANGED GWH{George W. Hancock - Head Chateauroux} 2 | ||