| Description | Date | Identifier | |
| Piston ring fitment issues and proposed clearance adjustments for 25/30 HP & 4 1/4 litre Bentley engines. | 18th Feb 1936 | Box 105 \ 2 scan0225 | |
| Proposal to reinstate oil drilling for the gudgeon pin boss on a 25-30 HP Chassis. | 11th May 1936 | Box 105 \ 2 scan0226 | |
| Sending of a sample piston for a 25/30HP Chassis to show drilling details. | 13th May 1936 | Box 105 \ 2 scan0227 | |
| Request for a set of high-pressure scraper rings for a C-16 Unit on a 21-G-IV Chassis. | 1st Jul 1936 | Box 105 \ 2 scan0228 | |
| Issue with Gudgeon Pin Knocks on the 25/30 HP Chassis. | 10th Jul 1936 | Box 105 \ 2 scan0229 | |
| Request to modify a set of 25/30 HP pistons to have ring stops. | 17th Jul 1936 | Box 105 \ 2 scan0230 | |
| Temporary solution for over-oiling in the 25/30 HP chassis by using 'L' shape piston rings. | 12th Aug 1936 | Box 105 \ 2 scan0231 | |
| Temporary solution for an over-oiling issue by using an 'L' shape piston ring for the 25/30 HP chassis. | 12th Aug 1936 | Box 105 \ 2 scan0232 | |
| Reversing a decision to use 'L' shape rings on the 25/30 HP chassis, with a handwritten note requesting testing. | 25th Aug 1936 | Box 105 \ 2 scan0233 | |
| Confirming a request to borrow and produce sets of 25/30 pistons. | 7th Jan 1938 | Box 105 \ 2 scan0234 | |
| Testing semi-balloon tyres and improving car stability by increasing front shock absorber friction. | 1st Jul 1925 | Box 105 \ 3 scan0001 | |
| Arrangement of India rear squeak dampers on existing cars without re-machining the drums. | 5th Oct 1925 | Box 105 \ 3 scan0002 | |
| Standardisation sheet discussing the modification of shock absorbers. | 16th Oct 1925 | Box 105 \ 3 scan0003 | |
| Expressing concern over the proposal to tighten shock-absorbers on the chassis without design modifications. | 17th Oct 1925 | Box 105 \ 3 scan0004 | |
| Clarifying previous points and discussing issues with suspension, tyres, and shock dampers in relation to road conditions. | 31th Mar 1926 | Box 105 \ 3 scan0005 | |
| Technical memorandum discussing improvements to vehicle suspension, damping, and handling, particularly for the 20 HP model. | 31th Mar 1926 | Box 105 \ 3 scan0006 | |
| Page discussing steering gear friction, tyre pressures, shock dampers, and axle control. | 1st Apr 1926 | Box 105 \ 3 scan0007 | |
| Fitting of hydraulic shock dampers to a 20 HP chassis. | 1st Apr 1926 | Box 105 \ 3 scan0008 | |
| Method of fixing a 20 HP shock damper and an objection to petrol pipe routing. | 10th Apr 1926 | Box 105 \ 3 scan0009 | |
| Instruction to replace soft stators with a new hardened type on the 20 HP rear friction-type shock damper. | 8th May 1926 | Box 105 \ 3 scan0010 | |
| The standardisation of hydraulic shock dampers for the 20 HP model. | 16th Jun 1926 | Box 105 \ 3 scan0011 | |
| Standardisation of hydraulic dampers on the front of the 20 HP chassis. | 18th May 1926 | Box 105 \ 3 scan0012 | |
| Adaptation of India hydraulic shock dampers to the 20HP frame. | 30th Jun 1926 | Box 105 \ 3 scan0013 | |
| Confirming the desired shock damper settings for 20 HP cars. | 7th Oct 1926 | Box 105 \ 3 scan0014 | |
| Lubrication issue with the 20 HP front hydraulic shock absorber connection. | 1st Dec 1936 | Box 105 \ 3 scan0015 | |
| Proposed shield for 20 HP shock dampers and a modification required for the forward shock damper bolt. | 19th Oct 1926 | Box 105 \ 3 scan0016 | |
| Request for details on the spring-loaded gland for a 20 HP rear shock damper. | 2nd Feb 1927 | Box 105 \ 3 scan0017 | |
| The results of trialling forced feed lubrication on shock absorbers for car 10-G-111 during a 10,000-mile test in France. | 21th Apr 1927 | Box 105 \ 3 scan0018 | |
| Proposal for mounting hydraulic shock dampers on the rear axle of a 20 HP vehicle. | 4th Apr 1927 | Box 105 \ 3 scan0019 | |
| Recommending modifications to hydraulic shock dampers for 20 HP and 40/50 HP cars. | 20th May 1927 | Box 105 \ 3 scan0020 | |
| Standardisation of hydraulic dampers on rear chassis. | 23th May 1927 | Box 105 \ 3 scan0021 | |
| Costs and logistics for standardizing a new chassis part. | 21th Nov 1927 | Box 105 \ 3 scan0022 | |
| Request to fit a pair of hydraulic shock absorbers to the rear of a 9-G3 car. | 21th Nov 1927 | Box 105 \ 3 scan0023 | |
| Recommending loads for the 20 HP rear shock absorber and questioning specified low loads on drawing F.54988. | 28th Nov 1927 | Box 105 \ 3 scan0024 | |
| Effectiveness of hydraulic dampers on Phantom and 20 HP models, with suggestions for design improvements. | 19th Feb 1928 | Box 105 \ 3 scan0025 | |
| Adjustments to hydraulic dampers for Phantom and 20 HP models. | 28th Feb 1928 | Box 105 \ 3 scan0026 | |
| Tests conducted on Phantom and 20 HP hydraulic dampers concerning staggering the orifices. | 30th Mar 1928 | Box 105 \ 3 scan0027 | |
| Page two of a report on shock absorber performance, showing test results for pressure with varying oil viscosity and temperature. | 30th Mar 1928 | Box 105 \ 3 scan0028 | |
| The development and principles of shock dampers for improved ride quality. | 30th Mar 1928 | Box 105 \ 3 scan0029 | |
| Analysis of shock absorber and rubber buffer performance in a vehicle's suspension system. | 30th Mar 1928 | Box 105 \ 3 scan0030 | |
| Comparing existing and ideal suspension damper performance characteristics using graphs. | 30th Mar 1928 | Box 105 \ 3 scan0031 | |
| Obtaining exact records of shock absorber loadings and internal pressures to improve vehicle riding characteristics. | 16th Oct 1928 | Box 105 \ 3 scan0032 | |
| Coachbuilder complaints regarding the difficult-to-access filling plug for the 20-HP shock absorbers. | 16th Oct 1928 | Box 105 \ 3 scan0033 | |
| Inaccessibility of shock absorber filling plugs and proposing design changes for easier access. | 19th Oct 1928 | Box 105 \ 3 scan0034 | |
| Fitting shock dampers to car GYL-62 to address a customer complaint about knocking. | 31th Oct 1928 | Box 105 \ 3 scan0035 | |
| Customer complaints about non-adjustable hydraulic rear shock absorbers and proposed solutions. | 31th Oct 1928 | Box 105 \ 3 scan0036 | |
| Noise on 20 HP hydraulic shock absorbers, comparing them to the 40/50 model. | 2nd Nov 1928 | Box 105 \ 3 scan0037 | |
| Complaints of knocking rear shock absorbers on the 20 HP car. | 28th Nov 1928 | Box 105 \ 3 scan0038 | |
| Difficulty in detecting shock absorber noise and a recommendation for the 20 HP rear damper. | 9th Nov 1928 | Box 105 \ 3 scan0039 | |
| Investigation into complaints of knocking from 20 HP rear shock absorbers. | 9th Nov 1928 | Box 105 \ 3 scan0040 | |
| Investigating a knocking complaint on 20 HP rear shock absorbers and the difficulty in replicating the issue. | 9th Nov 1928 | Box 105 \ 3 scan0041 | |
| Requesting the loan of a 20 HP Trials car to investigate knocking rear shock absorbers. | 2nd Nov 1928 | Box 105 \ 3 scan0042 | |
| Arrangement to investigate knocking rear shock absorbers on a car after a show. | 13th Nov 1928 | Box 105 \ 3 scan0043 | |
| Modifications to the clearances and limits for the 20 HP rear shock absorber. | 14th Nov 1928 | Box 105 \ 3 scan0044 | |
| Instructing a 20 HP 'Barkerlite' car, No. GXL.81, to be sent to the Works to investigate knocking rear shock absorbers. | 15th Nov 1928 | Box 105 \ 3 scan0045 | |
| Outlining five further tests to investigate shock damper knocks. | 21th Nov 1928 | Box 105 \ 3 scan0046 | |
| Investigation into the cause of knocking in shock absorbers on the 20 HP car, related to the non-return replenishing valve. | 4th Dec 1928 | Box 105 \ 3 scan0047 | |
| Noisy hydraulics potentially caused by a sticking shock-damper ball valve, with an accompanying blueprint. | 13th Dec 1928 | Box 105 \ 3 scan0048 | |
| Investigation into a noisy 20 HP rear shock damper, identifying a fouling lever and piston as the cause. | 13th Dec 1928 | Box 105 \ 3 scan0049 | |
| Page discussing ongoing investigations into shock absorber issues and the need for a suitable test vehicle. | 13th Dec 1928 | Box 105 \ 3 scan0050 | |
| Blueprint showing a cross-section of a 20 HP rear shock damper. | 22th Dec 1928 | Box 105 \ 3 scan0051 | |
| Potential delay in inspecting Chassis GBM. 22, arranging for a Mr. Lidsey to investigate. | 22th Dec 1928 | Box 105 \ 3 scan0052 | |
| Request to obtain one pair of 20 HP rear shock absorbers from production. | 22th Dec 1928 | Box 105 \ 3 scan0053 | |
| On noisy hydraulic dampers in 20 HP cars, identifying slack in the links as the primary cause of the noise. | 1st Jan 1929 | Box 105 \ 3 scan0054 | |
| Suggesting the reduction of side clearance in shock absorber links to resolve issues with noise. | 1st Jan 1929 | Box 105 \ 3 scan0055 | |
| Blueprint diagram of a hydraulic shock damper, indicating side clearance. | 31th Jan 1929 | Box 105 \ 3 scan0056 | |
| Investigation into knocking noises from 20 HP shock absorbers. | 31th Jan 1929 | Box 105 \ 3 scan0057 | |
| Modification to the 20 HP rear shock damper lever end. | 2nd Mar 1929 | Box 105 \ 3 scan0058 | |
| Request to urgently obtain sets of levers, pins, and eyes in nitro alloy steel for the 20 HP rear shock absorber. | 1st Mar 1929 | Box 105 \ 3 scan0059 | |
| Experimental use of nitro alloy steel for shock absorber links. | 6th Mar 1929 | Box 105 \ 3 scan0060 | |
| Modifications to 20 HP rear shock absorbers to reduce noise. | 11th Mar 1929 | Box 105 \ 3 scan0061 | |
| Temporary solution for knocking rear 20 HP shock dampers by drilling a hole in the high-pressure valve. | 21th Mar 1929 | Box 105 \ 3 scan0062 | |
| Preparing the rear shock absorbers for a 20 HP car that has run 10,000 miles. | 1st Mar 1929 | Box 105 \ 3 scan0063 | |
| Issues with drilled high pressure valves on 20 HP rear shock absorbers and a proposed modification. | 28th Mar 1929 | Box 105 \ 3 scan0064 | |
| To hold a modification on the 20 HP rear shock absorbers pending test results from another vehicle. | 28th Mar 1929 | Box 105 \ 3 scan0065 | |
| To hold a modification on 20 HP rear shock absorbers pending test results. | 28th Mar 1929 | Box 105 \ 3 scan0066 | |
| Letter regarding a modification to the 20 HP rear shock absorbers to reduce knocks. | 28th Mar 1929 | Box 105 \ 3 scan0067 | |
| To Mr. Hancock in France clarifying that a high pressure test should be confined to the 20 HP car. | 3rd Apr 1929 | Box 105 \ 3 scan0068 | |
| Design issues and proposed improvements for shock dampers. | 4th Apr 1929 | Box 105 \ 3 scan0069 | |
| Report discussing issues with 20 HP dampers, springs, and a heavy Hooper body. | 5th Apr 1929 | Box 105 \ 3 scan0070 | |
| Insufficient axle body damping and steering issues on a 20 HP vehicle. | 5th Apr 1929 | Box 105 \ 3 scan0071 | |
| Steering wobble, road testing of the 18-EX, and the potential of a new 20 HP front axle. | 5th May 1929 | Box 105 \ 3 scan0072 | |
| Technical memo detailing conclusions and recommendations on the design of hydraulic dampers. | 5th May 1929 | Box 105 \ 3 scan0073 | |
| Theory of damping in relation to stroke length, axle movement, and car speed. | 9th May 1929 | Box 105 \ 3 scan0074 | |
| Patented idea for automatically controlled shock dampers using an air spring. | 9th May 1929 | Box 105 \ 3 scan0075 | |
| Modifications and complaints regarding shock absorber knocks. | 1st Jul 1929 | Box 105 \ 3 scan0076 | |
| Shock absorber knocks, related modifications, and complaints on 20HP and 40/50HP models. | 3rd Jul 1929 | Box 105 \ 3 scan0077 | |
| Drilling high pressure valves on shock absorbers to cure knocks on 20 HP and 40/50 models. | 4th Jul 1929 | Box 105 \ 3 scan0078 | |
| Ongoing trouble with knocking shock dampers and proposed solutions. | 18th Nov 1929 | Box 105 \ 3 scan0079 | |
| Knocking issues and proposed modifications for 20 HP rear shock dampers. | 25th Nov 1929 | Box 105 \ 3 scan0080 | |
| Report on shock damper issues, specifically knocking and wear, to inform future design improvements. | 29th Nov 1929 | Box 105 \ 3 scan0081 | |
| Schemes for shock damper design, considering stroke length, damping rates, and controllable systems. | 12th Dec 1929 | Box 105 \ 3 scan0082 | |
| New schemes for Phantom II and 20 HP shock dampers, with reference to specific drawings. | 12th May 1929 | Box 105 \ 3 scan0083 | |
| The application of a spring connecting rod to 20 HP rear shock dampers. | 7th Dec 1929 | Box 105 \ 3 scan0084 | |
| Specifications for drilling holes in shock damper valves for 20 HP, Phantom 1, and Phantom 11 models. | 10th Dec 1929 | Box 105 \ 3 scan0085 | |
| History and function of drilled shock absorber valves. | 10th Dec 1929 | Box 105 \ 3 scan0086 | |
| Use of drilled valves and dampers on Phantom I and II models to improve ride quality. | 1st Dec 1929 | Box 105 \ 3 scan0087 | |
| Modifications to shock dampers using small air vessels to provide free motion. | 13th Dec 1929 | Box 105 \ 3 scan0088 | |
| Modification to shock absorber connection ball ends to improve lubrication. | 6th Feb 1930 | Box 105 \ 3 scan0089 | |
| Issues with shock absorber lubrication, dash-board brackets, and gearbox height. | 11th Mar 1930 | Box 105 \ 3 scan0090 | |
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