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).
Blueprint comparing two types of rivetless bonnet hinges.
| Identifier | ExFiles\Box 119\4\ scan0015 | |
| Date | 23th June 1931 guessed | |
| ARMSTRONG SIDDELEY RIVETLESS BONNET TOP HINGE ALUMINIUM BRASS STRIP (PLATED) SIDE HINGE THE ENDS OF THE ROLL ARE ADDITIONALLY SECURED BY INDENTATIONS BOTTOM WEARING PLATE RIVETLESS SHEET STEEL BONNET HINGES AS USED ON MORRIS AND OTHER CARS. TOP HINGE SIDE HINGE | ||