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).
Request to manufacture four modified clutch spring drives for the 20/25 HP model, with specific changes to hole diameters and spring wire gauge.
| Identifier | ExFiles\Box 103\1\ scan0016 | |
| Date | 8th February 1933 | |
| X15300 RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}13/KT. 8.2.33. CLUTCH SPRING DRIVE - 20/25 HP. Will you please make a further four spring drives to Hs.{Lord Ernest Hives - Chair}784. One modification we should like to the Ex. drgs. is a reduction in the dia. of the .406 holes acting as stops in the driven member to .340 to give ± 1½o.{Mr Oldham} We should also like a set of driving springs similar to the existing ones in every way except of .080 instead of .092 wire. We shall use two of these drives for cars belonging to Sales. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||