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 parts with their corresponding weight increases and decreases for the 5-B-IV 10,000 Miles Car.
| Identifier | ExFiles\Box 88\3\ scan0088 | |
| Date | 10th January 1935 | |
| x258 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}9/KW.10.1.35. 5-B-IV. 10,000 Miles Car - Weight Particulars. Particulars of Part. | Increase lbs. ozs. | Decrease lbs. ozs. --- | --- | --- 14" dia. brake drums | 18 10½ | Axle torsion shafts, strengthened type | 14 | Lightened cross member between headlamps | 4 0 | Large oil pump | 12¾ | Geared starter motor | 4 0 | Rubber engine mounting (front and rear) | 11 10 | Cantilever pedals | 1 6½ | Wilmot-Breeden bumper | 34 0 | Jackall Jacks complete | 46 10 | Centre spot lamp | 4 0 | Foot switch | 15 | Quick brake adjusters | 3 0 | Prop. shaft damper | 12 12 | Controlled dampers and pipe lines | 8 0 | Radiator - lightened Harrison 58 m/m.{Mr Moon / Mr Moore} matrix | | 12 8 Peregrine steering | | 9 10 Gearbox in Magnesium | | 8 6¼ 11" Borg & Beck clutch | | 20 3 Dashboard in magnesium | | 9 7 Exhaust system lightened | | 6 12 TOTAL = | 150 10¾ | 65 14¼ | ||