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).
Average life before breaking for front spring centre bolts.
| Identifier | ExFiles\Box 119\2\ scan0027 | |
| Date | 27th May 1914 guessed | |
| Wor{Arthur Wormald - General Works Manager}/Merl/L30414. SPRING BOLTS (3) Average life before breaking. K5900. Front Spring Centre Bolt, near side. 2 hrs 2 mins. average over 22. K5900. " " " off side 3 hrs 13 mins. average over 5 | ||