| Description | Date | Identifier | |
| Chassis parts standardization form detailing implementation questions, costs, and an approval log. | 8th Mar 1928 | Box 56 \ 3 Scan162 | |
| The deletion of the drain hole in the 20 HP chassis undershield. | 3rd Dec 1929 | Box 56 \ 3 Scan163 | |
| Standardisation of side and front engine guards. | 14th Oct 1931 | Box 56 \ 3 Scan164 | |
| Standardisation of Chassis Parts form for Six-End Engine Guards. | 19th Jan 1918 | Box 56 \ 3 Scan165 | |
| Secret memorandum detailing modifications to a side steering lever for a front axle. | 30th Apr 1925 | Box 56 \ 4 Scan001 | |
| Secret memo discussing modifications to a pivot to simplify machining, lighten the part, and strengthen the steering lever connection. | 30th Apr 1925 | Box 56 \ 4 Scan002 | |
| Part 9-G-111, querying if the stiffened tube N.sch.1797 is the latest version. | 1st Aug 1925 | Box 56 \ 4 Scan003 | |
| Modifications to the 20 HP steering system to address low-speed wobbles. | 1st Jan 1925 | Box 56 \ 4 Scan004 | |
| Revised springs for the India model side steering tube, increasing the maximum stress from 63,000 to 70,000 lbs/sq.in. | 27th Oct 1925 | Box 56 \ 4 Scan005 | |
| The design of a side steering lever for the India Front Axle. | 12th Nov 1925 | Box 56 \ 4 Scan006 | |
| Spring-loaded ball joints for India steering connections to prevent wobbles. | 28th May 1926 | Box 56 \ 4 Scan007 | |
| Comparative tests report on different steering systems for the Goshawk III. | 19th Aug 1926 | Box 56 \ 4 Scan008 | |
| Steering wobble at various speeds and the effects of modifying steering tubes and buffer springs. | 19th Aug 1926 | Box 56 \ 4 Scan009 | |
| Comparison of original and latest type side steering tube buffer springs, including load ratings and test results. | 23th Aug 1926 | Box 56 \ 4 Scan010 | |
| Fitting 1500 lb. springs to the side steering tube and suggesting a redesign to accommodate a greater number of coils. | 23th Aug 1926 | Box 56 \ 4 Scan011 | |
| Issues and suggesting modifications for the 20 HP side steering tube. | 15th Sep 1926 | Box 56 \ 4 Scan012 | |
| Modifying the 20 HP side steering tube springs due to a large number of steering complaints. | 30th Oct 1926 | Box 56 \ 4 Scan013 | |
| Steering improvements for the 20 HP chassis, comparing different worm and nut configurations. | 2nd Nov 1926 | Box 56 \ 4 Scan014 | |
| Steering issues, particularly joggles on the 20 HP model, and proposed modifications. | 12th Nov 1926 | Box 56 \ 4 Scan015 | |
| Steering improvements, wobble issues, and spring ratings for various car models. | 15th Nov 1926 | Box 56 \ 4 Scan016 | |
| Modified steering for existing 20-HP cars, specifically inquiring about improved side steering tube springs. | 15th Nov 1926 | Box 56 \ 4 Scan017 | |
| Development, testing, and implementation of a new steering system for the 20 HP model. | 15th Nov 1926 | Box 56 \ 4 Scan018 | |
| Steering modifications for the 20 HP model, comparing it to the Phantom and referencing a delay in introducing a new system. | 16th Nov 1926 | Box 56 \ 4 Scan019 | |
| Investigation into recurring failures of the 20 HP side steering tube, analyzing material properties and proposing solutions. | 16th Nov 1926 | Box 56 \ 4 Scan020 | |
| Improvements to the steering wheel and tube to reduce the joggling effect. | 16th Nov 1926 | Box 56 \ 4 Scan021 | |
| Modifications to the 20 HP side steering tube following failures during testing. | 18th Nov 1926 | Box 56 \ 4 Scan022 | |
| Proposal to fit a side steering tube with lighter springs on 20 HP 'J' Series cars to prevent customer complaints. | 19th Nov 1926 | Box 56 \ 4 Scan023 | |
| Improved side steering tube for the 20HP model. | 20th Nov 1926 | Box 56 \ 4 Scan024 | |
| Modification to the 20 HP side steering tube, seeking views on the proposal. | 20th Nov 1926 | Box 56 \ 4 Scan025 | |
| 20HP spring-loaded cross steering tube, referencing scheme 2201. | 24th Nov 1926 | Box 56 \ 4 Scan026 | |
| Advising to slow down production on steering tubes for the 20 HP model due to an imminent change. | 27th Nov 1926 | Box 56 \ 4 Scan027 | |
| Replacement of the 20 HP side steering tube and springs with an improved version. | 3rd Dec 1926 | Box 56 \ 4 Scan028 | |
| The production progress of the new 20 HP Side Steering Tube for the 'J' Series chassis. | 7th Dec 1926 | Box 56 \ 4 Scan029 | |
| Urgent internal request for one side steering tube for a 20 HP model, referencing a specific drawing number. | 9th Dec 1926 | Box 56 \ 4 Scan030 | |
| Proposed modification to the 20 HP side steering tube springs for existing cars. | 14th Dec 1926 | Box 56 \ 4 Scan031 | |
| Modifications to a 20 HP side steering tube to increase strength and fix wheel movement. | 14th Dec 1926 | Box 56 \ 4 Scan032 | |
| Proposed standardisation of a side steering tube improvement for the 20 HP model. | 17th Dec 1926 | Box 56 \ 4 Scan033 | |
| Instruction to produce and experimentally fit a new 600 lbs/inch spring for the side steering tube on a 20-HP chassis. | 18th Dec 1926 | Box 56 \ 4 Scan034 | |
| Forwarding a note concerning the urgent adoption of a stronger steering tube for the 20HP model due to safety concerns. | 20th Dec 1926 | Box 56 \ 4 Scan035 | |
| Outlining the replacement work for side steering tubes on 20 HP chassis. | 21th Dec 1926 | Box 56 \ 4 Scan036 | |
| Scheme and improvements for the side steering tube on the 20 HP 'J' Series chassis. | 21th Dec 1926 | Box 56 \ 4 Scan037 | |
| Experimental testing of different springs for the side steering tube on a 20-HP chassis. | 29th Dec 1926 | Box 56 \ 4 Scan038 | |
| Returning signed standardisation sheets, and retaining a New Phantom braking sheet pending testing. | 30th Dec 1926 | Box 56 \ 4 Scan039 | |
| Standardisation of a modified side steering tube to improve steering. | 3rd Dec 1926 | Box 56 \ 4 Scan040 | |
| A change in schedule for all changeovers. | 24th Dec 1926 | Box 56 \ 4 Scan041 | |
| Standardisation document for side steering tube ends to reduce joggles and road shocks. | 24th Dec 1926 | Box 56 \ 4 Scan042 | |
| Design choice for a 20 HP longitudinal steering tube. | 10th Jan 1927 | Box 56 \ 4 Scan043 | |
| Proposal to standardise 20 HP side steering tube springs following satisfactory test results. | 19th Jan 1927 | Box 56 \ 4 Scan044 | |
| Standardisation report for a modified side steering tube to improve steering. | 3rd Dec 1926 | Box 56 \ 4 Scan045 | |
| Standardization of side steering tube springs for 20 HP and 40/50 Phantom models. | 26th Jan 1927 | Box 56 \ 4 Scan046 | |
| Steering characteristics, comparing an existing arrangement with a new scheme pending extended road tests. | 26th Jan 1927 | Box 56 \ 4 Scan047 | |
| The mileage testing of a new arrangement on experimental cars. | 26th Jan 1927 | Box 56 \ 4 Scan048 | |
| Mileage testing for an arrangement on vehicle 9-GIII before customer release. | 26th Jan 1927 | Box 56 \ 4 Scan049 | |
| Standardisation proposal for side steering tube ends. | 24th Dec 1926 | Box 56 \ 4 Scan050 | |
| Standardisation of side steering tube springs to improve the 20 HP steering. | 10th Dec 1926 | Box 56 \ 4 Scan051 | |
| Agreement on the modification of side steering tube springs to avoid an expensive changeover. | 28th Jan 1927 | Box 56 \ 4 Scan052 | |
| Scheme for adding friction to the 20 HP steering column and a self-centering spring mechanism for the 40/50 model. | 28th Jan 1927 | Box 56 \ 4 Scan053 | |
| Listing points on steering column friction and self-centering forces. | 28th Jan 1927 | Box 56 \ 4 Scan054 | |
| Graph illustrating the relationship for an Angle DWT Pendulum Lever, with an overlaid standard letter. | 4th Feb 1927 | Box 56 \ 4 Scan055 | |
| Comparison of two schemes for 20 HP side steering tube springs, considering their performance under various road conditions. | 4th Feb 1927 | Box 56 \ 4 Scan056 | |
| Machining options for spring components and part selection for new cars. | 4th Feb 1927 | Box 56 \ 4 Scan057 | |
| Comparison of load versus deflection graphs for various vehicle spring schemes and standards. | 1st Apr 1927 | Box 56 \ 4 Scan058 | |
| The bad steering geometry of 20 HP cars, suggesting an experiment with a previously abandoned side steering lever. | 1st Apr 1927 | Box 56 \ 4 Scan059 | |
| Proposed improvements to the 20 HP steering geometry. | 30th Apr 1927 | Box 56 \ 4 Scan060 | |
| Clicking or knocking issue with the 20 HP side steering tube springs. | 5th May 1927 | Box 56 \ 4 Scan061 | |
| Modification to cure a click in the 20 HP side steering tube. | 14th May 1927 | Box 56 \ 4 Scan062 | |
| Parts and modification schemes for the 20-HP chassis side steering tube. | 21th May 1927 | Box 56 \ 4 Scan063 | |
| Request to test a spring-loaded side steering tube on a 20 HP vehicle. | 26th May 1927 | Box 56 \ 4 Scan064 | |
| Request to standardize the front steering arm on chassis 10-G-111. | 23th Jun 1927 | Box 56 \ 4 Scan065 | |
| Standardisation of a spring loaded front end side steering tube for chassis parts. | 21th Jun 1927 | Box 56 \ 4 Scan066 | |
| Record detailing the introduction of a new part to the 'L' Series chassis, including test date and associated costs. | 8th Oct 1927 | Box 56 \ 4 Scan067 | |
| Standardisation of chassis parts concerning a modification to the side steering tube end to prevent clicking. | 23th Jun 1927 | Box 56 \ 4 Scan068 | |
| Standardisation form for fitting a new part to an 'L' Series chassis. | 8th Sep 1927 | Box 56 \ 4 Scan069 | |
| Steering wobbles, joggles, and a standardised spring-loaded ball end for the 20 HP steering system. | 3rd Nov 1927 | Box 56 \ 4 Scan070 | |
| Graph comparing steering error curves between the present standard and a new scheme for a 20 HP chassis. | 7th Nov 1927 | Box 56 \ 4 Scan071 | |
| Experimental test results for S.S. tube joints under various schemes and spring loads. | 8th Nov 1927 | Box 56 \ 4 Scan072 | |
| Confirmation of modifications to the 20 HP side steering tube for improved clearance and geometry. | 27th Dec 1927 | Box 56 \ 4 Scan073 | |
| Failure of 20 HP side steering tube springs during testing and the proposal to use an improved version. | 1st Jan 1928 | Box 56 \ 4 Scan074 | |
| Importance of ensuring a straight side steering tube, referencing a previous instance on a 20 HP car. | 5th Mar 1928 | Box 56 \ 4 Scan075 | |
| Design procedure and shape of side steering tubes. | 28th Feb 1928 | Box 56 \ 4 Scan076 | |
| Modification details for the side steering tube on the 20-HP 'M' Series chassis to reduce steering speed. | 17th Apr 1928 | Box 56 \ 4 Scan077 | |
| Table detailing parts, ratings, and chassis fitment for 20 HP chassis side steering tube ends. | 8th May 1928 | Box 56 \ 4 Scan078 | |
| Modifications to the front springs, steering geometry and frame height. | 11th Nov 1928 | Box 56 \ 4 Scan079 | |
| Confirming receipt of instructions for Chassis 122-KR and its expected completion date. | 13th May 1929 | Box 56 \ 4 Scan080 | |
| Noisy starter on a 20 HP car, requesting replacement or investigation. | 18th Jun 1926 | Box 56 \ 4 Scan081 | |
| Production inspection and test specification for a 20 HP starter motor switch. | 18th Oct 1926 | Box 56 \ 4 Scan082 | |
| Test procedures for an electrical switch, including contact and insulation checks. | 11th Feb 1926 | Box 56 \ 4 Scan083 | |
| Suggesting a trial of a simplified sequence starter on the 20 HP model due to issues with the current RR Bijur starter. | 11th Feb 1926 | Box 56 \ 4 Scan084 | |
| The working mechanism of a 20 HP chassis starter pinion. | 11th Feb 1926 | Box 56 \ 4 Scan085 | |
| Page 2 of a document describing a spring-loaded pinion engagement mechanism. | 24th Jun 1927 | Box 56 \ 4 Scan086 | |
| Investigation into the causes of failures for the 20 HP starter motor. | 24th Jun 1927 | Box 56 \ 4 Scan087 | |
| Analysis of faults in a mechanical unit, detailing modifications to improve centralisation and engagement, and investigating issues with a cork clutch and spring tension. | 24th Jun 1927 | Box 56 \ 4 Scan088 | |
| Analysis of starter motor pinion engagement failure, attributing the issue to a weak spring and problems with cork discs. | 24th Jun 1927 | Box 56 \ 4 Scan089 | |
| Technical report on starter motor tests, detailing issues with pinion wear and slipping, and proposing solutions by adjusting spring loads. | 29th Jun 1927 | Box 56 \ 4 Scan090 | |
| Blueprint sketches illustrating issues with a spring-loaded pinion gear and flywheel engagement. | 29th Jun 1927 | Box 56 \ 4 Scan091 | |
| Investigations and suggested improvements for a 20 HP starter mechanism. | 29th Jun 1927 | Box 56 \ 4 Scan092 | |
| Modifications and reliability improvements for the 20 HP Improved Bijur starter. | 12th Jul 1927 | Box 56 \ 4 Scan093 | |
| Complaints and modifications for 20-HP starter motors. | 21th Sep 1927 | Box 56 \ 4 Scan094 | |
| Drawing detailing the addition of oil throwing grooves to an operating bush for a 20HP starter. | 26th Sep 1927 | Box 56 \ 4 Scan095 | |
| Two-stage improvement plan for the 20 HP starter. | 9th Jul 1927 | Box 56 \ 4 Scan096 | |
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