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 standard and modified clutch leverage for a 25 HP engine.
| Identifier | ExFiles\Box 179\2\ img118 | |
| Date | 1st January 1932 | |
| 25 HP CLUTCH OPERATION, MODIFIED LEVERAGE., CLUTCH FINGERS AND LEVERS 'A' AND 'B', ALSO STIFFENED UP IN SECTION, 'A', 2.3", 'B', 3.75", DIA. OF TRUNNION SHAFT, 1.250", -E- TILTED BACK, 1.250, STANDARD LEVERAGE., 2.750", 3.125", OUTSIDE DIA. OF, TRUNNION SHAFT 1.00", S/1/32 | ||