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).
Instruction to check that banjo holes are clear when the tappet filter is cleaned.
| Identifier | ExFiles\Box 96\2\ scan0275 | |
| Date | 26th November 1937 | |
| -2- RM{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}10/JH.26.11.37. book, that when the tappet filter is cleaned the banjo holes be checked for being clear. Rm{William Robotham - Chief Engineer}/L.H.Swindall. | ||