| Description | Date | Identifier | |
| Testing of an altered clutch on the 20/25 model. | 16th Jan 1935 | Box 103 \ 1 scan0146 | |
| Scheduling clutch tests on the 20/25 model at Cricklewood. | 22th Jan 1935 | Box 103 \ 1 scan0147 | |
| Logistics and methodology for clutch tests on a 20/25 HP car. | 22th Jan 1935 | Box 103 \ 1 scan0148 | |
| Clutch tests and arrangements for the 20/25 HP model. | 24th Jan 1935 | Box 103 \ 1 scan0149 | |
| Clutch tests on the 20/25 HP model, including feedback and suggestions for further testing. | 24th Jan 1935 | Box 103 \ 1 scan0150 | |
| Test report on a new 25 HP clutch for experimental car 21-G-4, noting its satisfactory performance and a minor issue when hot. | 25th Jan 1935 | Box 103 \ 1 scan0151 | |
| Necessity of testing an experimental clutch for the 20/25 model in London traffic. | 28th Jan 1935 | Box 103 \ 1 scan0152 | |
| Report quoting feedback on a clutch test, noting it as an improvement but also slow to stop. | 29th Jan 1935 | Box 103 \ 1 scan0153 | |
| Collected data on clutches, comparing pedal effort and separation across various chassis and proposing methods for improvement. | 4th Feb 1935 | Box 103 \ 1 scan0154 | |
| Pedal travel alterations on the chassis and a postscript about testing a new Spectre single plate clutch. | 4th Feb 1935 | Box 103 \ 1 scan0155 | |
| Planned test of a 20/25 car in London traffic, involving a change to the steering ratio. | 6th Feb 1935 | Box 103 \ 1 scan0156 | |
| Engine vibration periods on 20/25 HP cars when fitted with Bentley flywheels. | 6th Feb 1935 | Box 103 \ 1 scan0157 | |
| Note about arranging the testing of a 20/25 car with a special clutch and steering system in London traffic. | 7th Feb 1935 | Box 103 \ 1 scan0158 | |
| Vibration issue on the 20/25 model after fitting a Bentley flywheel and proposing a test modification. | 8th Feb 1935 | Box 103 \ 1 scan0159 | |
| The dispatch of a car for clutch and steering tests in London traffic. | 13th Feb 1935 | Box 103 \ 1 scan0160 | |
| Car received for clutch tests in London traffic, asking how long it can be kept. | 14th Feb 1935 | Box 103 \ 1 scan0161 | |
| Requesting the return of car 21-G-IV following steering and clutch tests. | 21th Feb 1935 | Box 103 \ 1 scan0162 | |
| Proposing the return of a car after 1,000 miles of clutch tests in London traffic. | 22th Feb 1935 | Box 103 \ 1 scan0163 | |
| Performance of a car's clutch and steering during traffic tests and the decision not to standardise the clutch. | 22th Feb 1935 | Box 103 \ 1 scan0164 | |
| Test report on clutch performance after 1,000 miles, detailing issues with jaggering and slipping in London traffic. | 26th Feb 1935 | Box 103 \ 1 scan0165 | |
| Unsatisfactory performance of a modified clutch and questioning testing procedures. | 27th Feb 1935 | Box 103 \ 1 scan0166 | |
| Clutch testing, alterations, and comparisons, particularly for the 25 HP model. | 28th Feb 1935 | Box 103 \ 1 scan0167 | |
| Copy of a report on testing the 21-G-1V clutch, noting it as an improvement but with a slow stopping issue. | 29th Jan 1935 | Box 103 \ 1 scan0168 | |
| Use of Borg & Beck clutches versus in-house designed clutches for various car models. | 27th Feb 1935 | Box 103 \ 1 scan0169 | |
| Decision to fit heavier flywheels on the 20/25 HP chassis to resolve engine period issues. | 5th Mar 1935 | Box 103 \ 1 scan0170 | |
| Confirming a new standard clutch driving plate has been fitted, while the fabric linings have been retained. | 7th Mar 1935 | Box 103 \ 1 scan0171 | |
| The fitting of a new clutch plate and dynamo to vehicle 21-G-IV. | 15th Mar 1935 | Box 103 \ 1 scan0172 | |
| Clutch tests, including specifications, endurance testing, and observations on engagement. | 13th Mar 1935 | Box 103 \ 1 scan0173 | |
| The testing and analysis of a Borg & Beck clutch, detailing performance, wear, and dismantling observations. | 13th Mar 1935 | Box 103 \ 1 scan0174 | |
| Testing and production of heavier flywheels for the 20/25 HP chassis. | 20th Mar 1935 | Box 103 \ 1 scan0175 | |
| Recommendation to revert to the heavy pre 'G' series flywheel for the 20/25 Chassis. | 21th Mar 1935 | Box 103 \ 1 scan0176 | |
| Correcting a previous document regarding the applicable chassis series for a heavier flywheel on the 20/25 HP model. | 21th Mar 1935 | Box 103 \ 1 scan0177 | |
| Letter to Hardy Spicer & Co. Ltd. requesting particulars for a Hardy Fabric Coupling with specific performance requirements. | 20th Apr 1934 | Box 103 \ 1 scan0178 | |
| Adapting and testing a Terraplane clutch spring drive in a standard production clutch. | 11th Apr 1935 | Box 103 \ 1 scan0179 | |
| Reconsideration of a chassis arrangement due to concerns about clutch slipping. | 23th May 1935 | Box 103 \ 1 scan0180 | |
| Internal memorandum on the 20/25 HP Chassis clutch, detailing reported issues and a temporary fix. | 27th May 1935 | Box 103 \ 1 scan0181 | |
| Internal correspondence regarding a customer complaint about clutch jagger issues on a 20/25 HP chassis. | 18th Sep 1935 | Box 103 \ 1 scan0182 | |
| Investigation of a reported clutch issue on a 20/25 HP car. | 18th Sep 1935 | Box 103 \ 1 scan0183 | |
| Complaints of 'clutch jaggers' on the 20/25 HP model and a request for more information. | 18th Sep 1935 | Box 103 \ 1 scan0184 | |
| A customer's complaint regarding a clutch defect, and a similar issue observed on a company car. | 20th Sep 1935 | Box 103 \ 1 scan0185 | |
| Persistent issue of 'clutch jaggers' in the 25 HP model. | 20th Sep 1935 | Box 103 \ 1 scan0186 | |
| 20/25 HP clutch, arranging for a car to be brought to Cricklewood for inspection. | 21th Sep 1935 | Box 103 \ 1 scan0187 | |
| Confirming an appointment at Cricklewood to investigate exhaust and potential clutch judder complaints. | 21th Sep 1935 | Box 103 \ 1 scan0188 | |
| The decision to use an 11' Borg & Beck clutch on 25 HP engines for Large Bore 20/25 Units. | 3rd Oct 1935 | Box 103 \ 1 scan0189 | |
| Official order for 20/25 HP clutches from Borg & Beck. | 18th Dec 1935 | Box 103 \ 1 scan0190 | |
| The 11' Borg and Beck Clutch, detailing associated schedules for modifying the clutch pedal layout and connecting link. | 2nd Jan 1935 | Box 103 \ 1 scan0191 | |
| Performance of the 11' Borg & Beck clutch on the Big Bore 20/25 HP and recommending against its immediate production. | 2nd Jan 1936 | Box 103 \ 1 scan0192 | |
| Modifications and comparisons for a 25-30 HP clutch. | 13th Jan 1936 | Box 103 \ 1 scan0193 | |
| Clutch modifications and comparisons for the 25-30 HP model. | 13th Jan 1936 | Box 103 \ 1 scan0194 | |
| Proposing new pressure plate springs for the 25-30 model clutch, referencing drawing N.Sch.4732. | 15th Jan 1936 | Box 103 \ 1 scan0195 | |
| Proposed pressure plate springs for a 25-30 clutch and modifications to the operating shaft boss. | 15th Jan 1936 | Box 103 \ 1 scan0196 | |
| Worsening clutch issues, particularly on the 20/25 HP model, and the urgency of finding a resolution. | 15th Jan 1936 | Box 103 \ 1 scan0197 | |
| Recommendations and requirements for an 11' Borg & Beck Clutch on a 20/25 model. | 17th Dec 1935 | Box 103 \ 1 scan0198 | |
| Flywheel change for the 20/25 HP chassis due to the adoption of a Borg & Beck clutch. | 17th Jan 1936 | Box 103 \ 1 scan0199 | |
| Secret internal memorandum discussing ongoing complaints about slipping clutches in the 20/25 HP model. | 20th Jan 1936 | Box 103 \ 1 scan0200 | |
| The poor record of the 20/25 clutch and the consideration of fitting a Borg & Beck clutch as a replacement. | 21th Jan 1936 | Box 103 \ 1 scan0201 | |
| Feedback on clutch tests for the 20/25 HP model and proposing further trials in London traffic. | 24th Jan 1935 | Box 103 \ 1 scan0202 | |
| Testing and comparison of different car clutches, including results from a 25 HP model and a Buick. | 28th Feb 1935 | Box 103 \ 1 scan0203 | |
| Clutch trial, noting it is a definite improvement but slow to stop. | 29th Jan 1936 | Box 103 \ 1 scan0204 | |
| Query regarding the conclusions of clutch tests conducted in London. | 30th Jan 1936 | Box 103 \ 1 scan0205 | |
| Performance and potential standardisation of Borg & Beck clutches for the 20/25 HP model. | 31th Jan 1936 | Box 103 \ 1 scan0206 | |
| Causes of clutch failures in the 25 HP model, attributing them to design flaws exacerbated by traffic conditions. | 29th Jan 1936 | Box 103 \ 1 scan0207 | |
| Clutch issues and testing for the 20/25 HP model. | 3rd Feb 1936 | Box 103 \ 1 scan0208 | |
| Return and potential design issues of E.60582a Tie Rods, including a list of returned sets. | 4th Feb 1936 | Box 103 \ 1 scan0209 | |
| Modifications and observations on the 11' Borg and Beck Clutch for the 25-30 HP model. | 5th Feb 1936 | Box 103 \ 1 scan0210 | |
| Examination of E.60582a Tie Rods in relation to complaints of clutch roughness. | 6th Feb 1936 | Box 103 \ 1 scan0211 | |
| Chasing a reply regarding ongoing trouble with 20/25 HP clutches. | 10th Feb 1936 | Box 103 \ 1 scan0212 | |
| The 20/25 Engine's Front Tie Rod and its effect on clutch performance. | 10th Feb 1936 | Box 103 \ 1 scan0213 | |
| Thrust spring specifications and ongoing tests for the 25/30 HP Borg & Beck clutch. | 11th Feb 1936 | Box 103 \ 1 scan0214 | |
| Test results and recommendations for the 25/30 HP Clutch. | 12th Feb 1936 | Box 103 \ 1 scan0215 | |
| Options and costs to rectify rapid clutch wear on present cars. | 12th Feb 1936 | Box 103 \ 1 scan0216 | |
| Performance of the Borg & Beck clutch and a required modification for the 25/30 HP model. | 12th Aug 1936 | Box 103 \ 1 scan0217 | |
| Letter to The Borg & Beck Co. Ltd. confirming new specifications for 11-inch production clutches. | 13th Feb 1936 | Box 103 \ 1 scan0218 | |
| Cure for jaggering clutches by replacing the front tie rod on 20/25 engines. | 13th Feb 1936 | Box 103 \ 1 scan0219 | |
| Confirming the successful replacement of tie rods on specific vehicle chassis. | 18th Feb 1936 | Box 103 \ 1 scan0220 | |
| Internal memorandum regarding fitting Borg & Beck clutches to 20/25 HP cars. | 18th Feb 1936 | Box 103 \ 1 scan0221 | |
| Request to manufacture a steel oil slinger for a 25/30 clutch, based on a Borg & Beck drawing. | 24th Feb 1936 | Box 103 \ 1 scan0222 | |
| 25 HP clutches, attaching two previous memos as evidence that a clutch was turned down. | 25th Feb 1936 | Box 103 \ 1 scan0223 | |
| Brief chaser memo regarding 20/25 HP clutches. | 25th Feb 1936 | Box 103 \ 1 scan0224 | |
| Order for 20/25 HP clutch facings with zinc wire instead of brass. | 18th Mar 1936 | Box 103 \ 1 scan0225 | |
| Requesting two 11-inch Borg & Beck clutches for the 25/30 HP be booked into the works for inspection. | 27th Mar 1936 | Box 103 \ 1 scan0226 | |
| Providing instructions for the replacement and refitting of clutch components for car 22-G-V. | 16th Apr 1936 | Box 103 \ 1 scan0227 | |
| Telegram regarding a chromium plated clutch plate fitted to an experimental car, which cannot be despatched. | 29th Apr 1936 | Box 103 \ 1 scan0228 | |
| Investigation into the cause of oily clutch jaggers on Bentley and 25/30 HP models. | 1st May 1936 | Box 103 \ 1 scan0229 | |
| Requesting an order for chromium plating to be applied to the friction surfaces of two 20/25 HP clutch driven plates. | 5th May 1936 | Box 103 \ 1 scan0230 | |
| Letter to Durion Ltd. regarding the urgent chromium plating of two clutch driven plates. | 5th May 1936 | Box 103 \ 1 scan0231 | |
| Letter from Durion Limited acknowledging receipt of two clutch driven plates for attention. | 6th May 1936 | Box 103 \ 1 scan0232 | |
| Delay in material selection for Bentley & 25/30 HP clutches. | 15th May 1936 | Box 103 \ 1 scan0233 | |
| Investigation into clutch 'jagger' issues on Bentley 25/30 HP models, identifying parallelism problems and new setting specifications. | 15th May 1936 | Box 103 \ 1 scan0234 | |
| Short message regarding unsuccessful chromium plate tests. | 21th May 1936 | Box 103 \ 1 scan0235 | |
| Clutch changes for the Bentley & 30 HP model, addressing timing mark misalignment. | 13th Oct 1936 | Box 103 \ 1 scan0236 | |
| The fixing and erection of clutches and flywheel timing marks for 25/30 HP and Bentley models. | 2nd Nov 1936 | Box 103 \ 1 scan0237 | |
| Request to inspect a 22-OV clutch for wear between the pressure plate lugs and the cover slots. | 9th Nov 1936 | Box 103 \ 1 scan0238 | |
| Clarifying the quantity of 20/25 HP flywheels replaced due to gear ring damage over a 12 month period. | 3rd Nov 1936 | Box 103 \ 1 scan0239 | |
| Comparison of component data for P.III, 25/30, and Bentley models. | 1st Jul 1937 | Box 103 \ 1 scan0240 | |
| Specifications for a Single Plate 12.C.B. Clutch as supplied to Lincoln. | 14th Feb 1934 | Box 103 \ 1 scan0241 | |
| Letter from Long Manufacturing Co. to Mr. Robotham providing specifications for a 12' single plate clutch. | 20th Feb 1934 | Box 103 \ 1 scan0242 | |
| Rapid wear on 20/25 HP clutch facings and proposing a trial of new metallic facings from an external supplier. | 10th Sep 1937 | Box 103 \ 1 scan0243 | |
| Testing Thermoid clutch facings for 25/30 and Bentley models, detailing performance, bursting speeds and recommendations. | 10th Sep 1937 | Box 103 \ 1 scan0244 | |
| Proposal for destructive comparative testing of metallic clutch facings for the 20/25 HP model. | 2nd Oct 1937 | Box 103 \ 1 scan0245 | |
| | | | |
