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 proposed modifications to vehicle components and associated cost reductions.
| Identifier | ExFiles\Box 148\2\ scan0201 | |
| Date | 15th June 1939 | |
| -2- Rm{William Robotham - Chief Engineer}3/R:15.6.39. Reduction 4 pistons FB.4608 - to be made from bar 1 - - Long Bolts KB.1635 - 8 reduced to 4 in a new scheme about to be run on Continental car. Bolt head to be cold formed. Bolts to be supplied by the Acton Bolt Co. 1 - - 4 Main shaft bushes FB.3434 to be run in Vandervell Clevite 1 - - 2 Top covers to be made as pressings instead of castings 3 - Oil Seals, the type at present being used by Gordon Armstrong to be tried 2 - - The following price reductions were thought to be possible on the remainder of the front suspension:- Hubs, as previously mentioned 1 10 - Lower Triangular levers FB.4453/4 modified to simplified forging as fitted to the Continental car 4 - - Torque arm to be made either as a pressing or a semi-steel casting, and tested out by AFM.{Anthony F. Martindale} 6 - Front axle yokes to be made in 1% chrome 4 - Pivots to be made in 3 1/2% nickel 3/- Spherical torque arm bearing cast iron FB.3647 3 6 Rubber Spring Seating FB.3066 to be made by Ferodos 1 6 £2 17 3 | ||