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).
Comparison table of steering component weights for various chassis models.
| Identifier | ExFiles\Box 88\3\ scan0188 | |
| Date | 31th March 1936 | |
| x258 To Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}23/KW.31.3.36. Comparative Steering Weights. Component | Ph.III | 20/25 | 25/30 | Bentley Steering gear, with wheel, controls, pendulum lever, and ball pin (dry). | 48.62 | 39.00 | 49.00 | 43.06 Side steering tube with front ball pin | 5.62 | 5.00 | 5.00 | 4.44 Bell Crank Lever on Ph.III.) Half ramshorn lever on other chassis. | 11.00 | 1.94 | 1.94 | 1.31 Cross Steering tube with ball pins (two tubes on Ph.III). | 8.50 | 6.62 | 6.62 | 5.62 TOTAL: | 73.74 | 52.56 | 62.56 | 54.43 Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||