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).
Weight comparison table for Lovejoy and 20 HP rear shock damper components.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan197 | |
| Date | 30th January 1931 guessed | |
| SHOCK DAMPER WEIGHTS. Lovejoy & 20 HP. Rear. DETAILS WEIGHTS. | LOVEJOY, | 20 HP. REAR Cylinder only. | 7 lbs. 10 ozs. | 2 lbs. 12 ozs Cylinder only, complete with end cover, top cover, valves, etc. | 8 lbs. 13 ozs. | 4 lbs. 2 ozs Piston - complete. | 1 lb. 14 ozs. | 1 lb 6 ozs Inter - lever - complete | 1 lb. 8 ozs. | 13 ozs) } R Main Lever - complete | 1 lb. 13 ozs. | 1 lb 15 ozs) TOTAL | 14 lbs. 0 ozs. | 8 lbs. 4 ozs. DAMPER COMPLETE * | 13 lbs. 15 ozs. | 8 lbs 3 ozs * Combined these wts. are comparative. | ||