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).
List of modifications, numbered 16 to 30, detailing changes to various mechanical components.
| Identifier | ExFiles\Box 94\1\ scan0084 | |
| Date | 14th January 1935 | |
| - sheet 3 - (16) Bolt head stops deleted from actuating sleeve. N. Sch.4252. Hdy.{William Hardy}2/HP.5.11.34. (17) Flanges on casing increased in thickness in various places. Hdy.{William Hardy}4/HP.5.11.34. (18) Lower ratio servo drive and speedometer drive to suit N. Sch.4257 Hdy.{William Hardy}1/MN.9.11.34, and Hdy.{William Hardy}1/MN.14.11.34. (19) Modifications to retaining lip for rear bearing for 3rd motion shaft Hdy.{William Hardy}2/MN.14.11.34. (20) Modification to casing to accommodate larger servo N. Sch.4264 Hdy.{William Hardy}3/MN.14.11.34 and Hdy.{William Hardy}1/MN.19.11.34. (21) 1st speed actuation with increased leverage. N. Sch.4275. Hdy.{William Hardy}1/HP.29.11.34. (22) Larger servo arranged for semi-servo system. N. Sch.4263. Hdy.{William Hardy}1/HP.3.12.34. (23) Vent holes in 2nd speed retaining plate and communication hole in diaphragm. N. Sch.4266. Hdy.{William Hardy}1/HP.4.12.34. (24) Gearbox perpendicular to the transmission. Hdy.{William Hardy}2/HP.7.12.34. (25) The housings for the ball bearings for the 2nd speed sliding rod not to be case hardened but to be treated to give a high Brinell hardness. Hdy.{William Hardy}1/HP.7.12.34. (26) Dowel bolts between casing halves moved down on reverse shaft side. Hdy.{William Hardy}1/HP.8.12.34. (27) Ball bearing of standard type between servo and servo drive shaft. Hdy.{William Hardy}2/MN.19.12.34. (28) Shorter bushes for the spigot bearing and 2nd and 3rd speed gears. Hdy.{William Hardy}1/HP.1.1.35. (29) 2nd speed synchromesh pieces modified to prevent working out of mesh. N. Sch.4320. Hdy.{William Hardy}3/HP.2.1.35. (30) 1st speed gears giving .37 ratio. N. Sch.4326. Hdy.{William Hardy}2/HP.3.1.35. | ||