| Description | Date | Identifier | |
| Follow-up memo regarding a 20/25 HP clutch slip, requesting a reply about a circular gauge for testing clutch serrations. | 29th Sep 1933 | Box 103 \ 1 scan0046 | |
| The arrangement of cars to test for a 20/25 model clutch slip issue. | 30th Sep 1933 | Box 103 \ 1 scan0047 | |
| Revised visit schedule to inspect a car with a 20/25 clutch slip issue. | 2nd Oct 1933 | Box 103 \ 1 scan0048 | |
| Standardisation of a spring drive in the clutch to eliminate rattles in the transmission. | 20th Jun 1933 | Box 103 \ 1 scan0049 | |
| Form for the standardisation of chassis parts, detailing the testing of a new part. | 12th Dec 1933 | Box 103 \ 1 scan0050 | |
| Reply concerning the availability of a car with a 20/25 HP clutch slip issue for inspection. | 2nd Oct 1933 | Box 103 \ 1 scan0051 | |
| Rectifying clutch slip complaints on the 20/25 model by improving pressure plate manufacturing accuracy. | 4th Oct 1933 | Box 103 \ 1 scan0052 | |
| Slipping clutch on a 20/25 HP car, chassis GHW-47, and arranging a potential inspection. | 6th Oct 1933 | Box 103 \ 1 scan0053 | |
| Short memo confirming the arrival of 'Hs/Gry.' at Cricklewood. | 7th Oct 1933 | Box 103 \ 1 scan0054 | |
| Complaints and potential solutions for oil contamination in the 25 HP clutch. | 12th Oct 1933 | Box 103 \ 1 scan0055 | |
| The investigation into quarterly complaints of clutch slip on 20/25 models, identifying causes and recommending a fix. | 12th Oct 1933 | Box 103 \ 1 scan0056 | |
| Requesting success rate data for clutch dismantling and re-lining treatments. | 12th Oct 1933 | Box 103 \ 1 scan0057 | |
| 20/25 HP clutch trouble caused by excessive oil from the main bearing and a proposed solution. | 12th Oct 1933 | Box 103 \ 1 scan0058 | |
| Drastic but successful treatment for clutch complaints on the 20/25 HP model. | 30th Oct 1933 | Box 103 \ 1 scan0059 | |
| 20/25 HP clutch complaints, referencing a Depot Sheet to fix slipping. | 31th Oct 1933 | Box 103 \ 1 scan0060 | |
| Acknowledging the issuance of a Depot Sheet regarding complaints about the 20/25 HP clutch. | 1st Nov 1933 | Box 103 \ 1 scan0061 | |
| Adaptation of the J.3 Clutch for a separate gearbox arrangement, referencing schematics 3814 and 3828. | 4th Nov 1933 | Box 103 \ 1 scan0062 | |
| Clarifying a discrepancy in the slack specification for serrations on a pressure ring for the 20/25 HP model. | 6th Nov 1933 | Box 103 \ 1 scan0063 | |
| N. Sch. 3818 clutch casing for the J.3 project with separate gearbox, including details on the mechanical front brake differential and modifications for a hydraulic system. | 6th Nov 1933 | Box 103 \ 1 scan0064 | |
| Fitting a relay clutch device, shock dampers, and a new carburetter to an older model car, 20-G4. | 7th Nov 1933 | Box 103 \ 1 scan0065 | |
| External clutch adjustment for the 25-HP model. | 10th Nov 1933 | Box 103 \ 1 scan0066 | |
| Modifications for a J.3. Gearbox 2nd speed S.M. clutch. | 30th Nov 1933 | Box 103 \ 1 scan0067 | |
| Quarterly complaints report detailing clutch slip issues and their resolutions on various cars. | 7th Dec 1933 | Box 103 \ 1 scan0068 | |
| Report summarizing the outcomes of clutch repairs on a list of 21 cars. | 10th Jan 1934 | Box 103 \ 1 scan0069 | |
| Customer complaints related to clutch jaggering and slipping. | 10th Jan 1934 | Box 103 \ 1 scan0070 | |
| Persistent clutch slipping and jaggering issue on chassis GWX/34 and an angry customer. | 11th Jan 1934 | Box 103 \ 1 scan0071 | |
| Technical and policy implications of fitting a new flywheel and clutch to a customer's car. | 12th Jan 1934 | Box 103 \ 1 scan0072 | |
| Standardisation of parts for the bifurcated riveting of clutch linings. | 1st Jan 1934 | Box 103 \ 1 scan0073 | |
| Investigation of repeated clutch trouble on Mr. Potter's car, chassis GWX-34. | 25th Jan 1934 | Box 103 \ 1 scan0074 | |
| Performance and potential future use of a semi-vacuum clutch control. | 12th Feb 1934 | Box 103 \ 1 scan0075 | |
| Requesting to test a new clutch (N.Sch. 3948) on the C.13 Unit Test Bed. | 15th Feb 1934 | Box 103 \ 1 scan0076 | |
| Differences between American and English car clutches and design philosophies. | 24th Feb 1934 | Box 103 \ 1 scan0077 | |
| Investigation into a cracked pressure ring from a 20/25HP Chassis clutch. | 1st Mar 1934 | Box 103 \ 1 scan0078 | |
| Failed chassis pressure ring, attributing the cause to centrifugal effects and noting a new material standardisation. | 5th Mar 1934 | Box 103 \ 1 scan0079 | |
| Request to arrange an experiment to determine the cause of failure in cast-iron clutch pressure plates. | 8th Mar 1934 | Box 103 \ 1 scan0080 | |
| New clutch adjustment method using the outside pedal connecting rod for future production cars. | 12th Mar 1934 | Box 103 \ 1 scan0081 | |
| Reporting another failure of Pressure Ring G55792 on a 20/25HP chassis during testing. | 22th Mar 1934 | Box 103 \ 1 scan0082 | |
| Cracking clutch pressure plates on Bentley and 20/25 HP chassis, suggesting a modification to the inside diameter. | 23th Mar 1934 | Box 103 \ 1 scan0083 | |
| Requesting endurance tests for 20/25 and Bentley clutches on a specific unit. | 27th Mar 1934 | Box 103 \ 1 scan0084 | |
| Standardisation of a pressure ring in clutch made in nickel steel. | 23th Feb 1934 | Box 103 \ 1 scan0085 | |
| Querying whether to proceed with the production of parts for a lightened clutch or await test results. | 11th Apr 1934 | Box 103 \ 1 scan0086 | |
| Reduction of spring load on a clutch's inner pressure plate. | 20th Apr 1934 | Box 103 \ 1 scan0087 | |
| Fitting of a Borg & Beck type clutch to a 20/25 HP car. | 4th May 1934 | Box 103 \ 1 scan0088 | |
| Moment of inertia test calculations for a Bentley flywheel and clutch from a C.10 engine. | 8th May 1934 | Box 103 \ 1 scan0089 | |
| Experimental department report on the testing of a new clutch for the 20/25 and Bentley chassis. | 23th May 1934 | Box 103 \ 1 scan0090 | |
| Clutch destruction tests and investigations into clutch slip for 20/25 and Bentley models. | 23th May 1934 | Box 103 \ 1 scan0091 | |
| Clutch jagger issues caused by flexible engine mountings and the testing of a new clutch. | 23th May 1934 | Box 103 \ 1 scan0092 | |
| Methodology for clutch tests on 20/25 HP and Bentley models. | 3rd May 1934 | Box 103 \ 1 scan0093 | |
| Tests comparing various types of clutch linings and their performance regarding wear and slippage. | 3rd May 1934 | Box 103 \ 1 scan0094 | |
| Table of results for clutch lining wear tests performed on a 25 HP & Bentley. | 3rd May 1934 | Box 103 \ 1 scan0095 | |
| Test results table for wear and performance of different material linings under various conditions. | 3rd May 1934 | Box 103 \ 1 scan0096 | |
| Test report comparing the performance and wear of different types of clutch linings. | 5th May 1934 | Box 103 \ 1 scan0097 | |
| Modification drawing for flywheel G56671. | 21th Apr 1934 | Box 103 \ 1 scan0098 | |
| Modifications to a 20/25 HP clutch to resolve flywheel flutter issues. | 24th May 1934 | Box 103 \ 1 scan0099 | |
| Clutch experiments and proposed modifications to the friction and pressure plates. | 25th May 1934 | Box 103 \ 1 scan0100 | |
| Letter from Small & Parkes Ltd. proposing and quoting prices for a 'Donflex' Clutch Disc for experimental purposes. | 6th Jun 1934 | Box 103 \ 1 scan0101 | |
| Letter from Small & Parkes Ltd. discussing the production of a 'DON-FLEX' clutch disc and necessary modifications for an oil thrower ring. | 29th May 1934 | Box 103 \ 1 scan0102 | |
| Ordering of a clutch centre for a 20/25 model from Messrs. Small & Parkes Ltd. | 8th Jun 1934 | Box 103 \ 1 scan0103 | |
| Letter to Messrs. Small & Parkes Ltd. regarding alterations to a clutch centre blueprint and an enquiry about cork inserts. | 8th Jun 1934 | Box 103 \ 1 scan0104 | |
| Clutch tests, requesting to fit standard RAD.11 material to the centre plate with specific movement tolerances. | 11th Jun 1934 | Box 103 \ 1 scan0105 | |
| Letter to Messrs. Bowden Ltd. requesting two custom pieces of Bowden cable for an experimental job. | 13th Jun 1934 | Box 103 \ 1 scan0106 | |
| To Roy forwarding a copy of a letter to Messrs. Bowden for the supply of Bowden Cable. | 14th Jun 1934 | Box 103 \ 1 scan0107 | |
| Letter from Bowden (Engineers) Ltd concerning an enquiry for Bowdenex T.4 conduit and fittings, requesting dimensions and discussing welding procedures. | 15th Jun 1934 | Box 103 \ 1 scan0108 | |
| Letter to a supplier regarding modifications to a blueprint for two cables and brackets. | 16th Jun 1934 | Box 103 \ 1 scan0109 | |
| Letter from Bowden (Engineers) Ltd confirming the dispatch of two special cable assemblies. | 20th Jun 1934 | Box 103 \ 1 scan0110 | |
| Telegram received by telephone concerning despatched cables. | 20th Jun 1934 | Box 103 \ 1 scan0111 | |
| Telegram received by telephone regarding a dispatched cable. | 20th Jun 1934 | Box 103 \ 1 scan0112 | |
| Letter to Messrs. Bowden (Engineers) Ltd. acknowledging their letter of 20th June. | 21th Jun 1934 | Box 103 \ 1 scan0113 | |
| Summary list of clutch experiments with different configurations and notes. | 2nd Jul 1934 | Box 103 \ 1 scan0114 | |
| Proposed link for the 20/25 HP clutch operation to ensure smooth engagement. | 3rd Jul 1934 | Box 103 \ 1 scan0115 | |
| Internal inquiry regarding slipping clutches on the 25 HP model. | 13th Jul 1934 | Box 103 \ 1 scan0116 | |
| Customer complaint regarding clutch failures on a 20/25 HP Chassis, model GXB-1. | 13th Jul 1934 | Box 103 \ 1 scan0117 | |
| Concerning 20/25 HP clutches and a related flywheel. | 16th Jul 1934 | Box 103 \ 1 scan0118 | |
| Authorising payment for cables mentioned in a prior communication. | 16th Jul 1934 | Box 103 \ 1 scan0119 | |
| Modifications and testing related to 20/25 HP clutches to reduce slipping. | 17th Jul 1934 | Box 103 \ 1 scan0120 | |
| 20/25 HP clutch complaint. | 18th Jul 1934 | Box 103 \ 1 scan0121 | |
| Ongoing clutch slipping issues in the 20/25 HP cars, modifications, and complaint statistics. | 18th Jul 1934 | Box 103 \ 1 scan0122 | |
| Letter to E.J. Goldberg regarding a driver's experiments on clutch slipping and arranging a service for rear axle noise. | 24th Jul 1934 | Box 103 \ 1 scan0123 | |
| Issues with a slipping clutch and axle noise, and the experiments conducted to resolve them. | 24th Jul 1934 | Box 103 \ 1 scan0124 | |
| Slipping clutches, potential oil seal improvements, and new clutch designs for Bentley and 20/25 models. | 24th Jul 1934 | Box 103 \ 1 scan0125 | |
| Proposal to address slipping clutches on 20/25 HP models by fitting a specially designed oil seal. | 25th Jul 1934 | Box 103 \ 1 scan0126 | |
| Proposed solution to oil fumes contaminating the 20/25 HP clutch fabric. | 10th Aug 1934 | Box 103 \ 1 scan0127 | |
| Chasing a reply regarding 20/25 HP Clutches. | 22th Aug 1934 | Box 103 \ 1 scan0128 | |
| Clutch issue on 20/25 & Bentley models due to a rusting shaft and proposing the use of gun metal bushes as a solution. | 28th Aug 1934 | Box 103 \ 1 scan0129 | |
| Fitting of an oil seal to the 20/25 HP clutch to address oil leaks and its potential production implementation. | 5th Sep 1934 | Box 103 \ 1 scan0130 | |
| Summary list of various clutch experiments and their respective setups. | 10th Sep 1934 | Box 103 \ 1 scan0131 | |
| Requesting definite information regarding 20/25 HP clutches. | 3rd Sep 1934 | Box 103 \ 1 scan0132 | |
| Standardisation of parts for an external clutch adjustment. | 17th Jul 1934 | Box 103 \ 1 scan0133 | |
| Cost estimate for extra jigs, tools and equipment to bring the 'G' series chassis into production. | 27th Jul 1934 | Box 103 \ 1 scan0134 | |
| Requesting the build of a clutch for a C-14 21-G-IV 10,000 miles test with specific alterations. | 21th Sep 1934 | Box 103 \ 1 scan0135 | |
| Test report on a 20/25 HP flywheel and clutch at high speeds. | 8th Oct 1934 | Box 103 \ 1 scan0136 | |
| Changing from bifurcated to ordinary rivetting on specific clutches to prevent fabric damage. | 20th Oct 1934 | Box 103 \ 1 scan0137 | |
| Reverting to old riveting methods for clutches on Spectre, 20/25, and Bentley models. | 23th Oct 1934 | Box 103 \ 1 scan0138 | |
| Flywheel vibration on a 20/25 clutch, discussing a modification and requesting a 10,000-mile test. | 2nd Nov 1934 | Box 103 \ 1 scan0139 | |
| Standardisation of a Bentley type lightened flywheel and clutch for the 25 HP model. | 7th Sep 1934 | Box 103 \ 1 scan0140 | |
| Estimated cost of extra jigs, tools and equipment for the 'G' series chassis. | 20th Sep 1934 | Box 103 \ 1 scan0141 | |
| Confirming a meeting and discussing modifications to the servo and clutch systems for various car models. | 15th Nov 1934 | Box 103 \ 1 scan0142 | |
| Requesting the preparation of three sets of an improved 20/25 HP clutch for trials in London traffic. | 28th Nov 1934 | Box 103 \ 1 scan0143 | |
| Testing of jacks and the weight of a front harmonic stabilising bumper on a 20/25 HP car. | 29th Nov 1934 | Box 103 \ 1 scan0144 | |
| Clutch experiments on various unit configurations. | 7th Jan 1935 | Box 103 \ 1 scan0145 | |
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