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 showing the specified amount of twist for Near Side and Off Side shafts.
| Identifier | ExFiles\Box 84\4\ scan0029 | |
| Date | 26th July 1934 | |
| AMOUNT OF TWIST AS SHOWN AT C NEAR SIDE SHAFT:- .300 OFF SIDE SHAFT:- .400 R.H.C. ROLLS-ROYCE, LTD PRINT ROOM 26 JUL 1934 DERBY. | ||