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).
Directive regarding the non-use of castellated nuts for the cylinder head and valve gear.
| Identifier | ExFiles\Box 48\4\ Scan051 | |
| Date | 21th October 1921 | |
| X4226 21.10.21. Extract from E1/G21.10.21. X.4219 CYLINDER AND VALVE GEAR NUTS. X.4225 X.4226 Mr. Royce does not wish the cylinder head nuts, whether enclosed or outside, to be castellated, neither should the nuts which secure the dog clamping the valve tappet guides be castellated. E.{Mr Elliott - Chief Engineer} | ||