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).
Specification sheet for rollers used in Spectre & 20/25 HP steering parts.
| Identifier | ExFiles\Box 28\3\ Scan202 | |
| Date | 27th September 1935 | |
| x1300 27.9.35. SpectreCodename for Phantom III & 20/25 HP. Steering Parts. Rollers. Rollers are not handed and not affected by crowning. No. | Lead | Type of Bearing | Our No. | Adamant No. ---|---|---|---|--- 1 | 0.800 | Adamant | F.87552 | M.21116 2 | 0.800 | Timken | F.87756 | 3. | 0.700 | Ball | F.87682 | M.21504 4 | 0.700 | Timken | F.87900 | HS{Lord Ernest Hives - Chair}/F.J.H. | ||