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).
Alteration of the collar angle for the tappet cover cap nut due to a drawing office error.
| Identifier | ExFiles\Box 134\5\ scan0065 | |
| Date | 17th May 1940 | |
| To RM.{William Robotham - Chief Engineer} 1133 168 / RE 17 MAY 1940 B40 SECTION 5000 RE.218 - CAP NUT - TAPPET COVER ALTERATION 120° ANGLE OF COLLAR TO 150° REASON D.O. ERROR Slang | ||