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 diagram showing a modification for a Bentley 25/30 cylinder to address cracking.
| Identifier | ExFiles\Box 103\2\ scan0119 | |
| Date | 2nd February 1937 guessed | |
| BENTLEY & 25/30. CYLINDER. CRACKS EXTRA SCREW. | ||