| Description | Date | Identifier | |
| The decision to revert to a hand oiling hole for the 20/25 HP Servo, discontinuing the Bijur oiling system. | 11th Oct 1933 | Box 105 \ 4 scan0121 | |
| Instructing to use Ferodo S.3914 material for the linings of fully floating servos. | 16th Oct 1933 | Box 105 \ 4 scan0122 | |
| Servo jaggering issue on the 20/25 HP chassis, referencing clearances and previous instructions. | 19th Oct 1933 | Box 105 \ 4 scan0123 | |
| Standardisation document regarding the deletion of Bijur lubrication to the servo on 20/25 HP chassis. | 17th Jul 1933 | Box 105 \ 4 scan0124 | |
| Standardisation form for chassis parts detailing implementation and costs. | 13th Nov 1933 | Box 105 \ 4 scan0125 | |
| Modification to the 25 HP and Bentley Servo concerning the enclosure of liner discs. | 13th Nov 1933 | Box 105 \ 4 scan0126 | |
| Mistake in standardising the increased front braking for 25 HP cars and the proposed solution. | 18th Nov 1933 | Box 105 \ 4 scan0127 | |
| Standardisation of baffles to prevent oil working along the servo countershaft. | 4th Nov 1933 | Box 105 \ 4 scan0128 | |
| Use of ball versus needle bearings for the servo shaft on 20/25 and Bentley cars. | 2nd Jan 1934 | Box 105 \ 4 scan0129 | |
| Request to construct a servo output measuring rig for 20/25 and Bentley models. | 10th Feb 1934 | Box 105 \ 4 scan0130 | |
| Modifications to servos on 20/25 and Bentley models, regarding driving pins and lining materials. | 1st Mar 1934 | Box 105 \ 4 scan0131 | |
| Parts list and blueprint notification for the servo motor and mechanism of a 20/25-HP & Bentley standard type servo. | 17th Mar 1934 | Box 105 \ 4 scan0132 | |
| Parts list detailing replacements, additions, and exceptions for a specific unit assembly. | 17th Mar 1934 | Box 105 \ 4 scan0133 | |
| Tests to determine the equal distribution of the 20/25 and Bentley servo motor output to the front and back brakes. | 26th Mar 1934 | Box 105 \ 4 scan0134 | |
| Analysis of servo output distribution, the effects of friction at various bearings, and the impact of mechanism geometry in forward and reverse gears. | 19th Apr 1934 | Box 105 \ 4 scan0135 | |
| Diagram for servo tests on the 20/25 and Bentley models. | 19th Apr 1934 | Box 105 \ 4 scan0136 | |
| Graph charting the distribution of servo output to the front and rear brakes for 20/25 and Bentley models. | 4th May 1934 | Box 105 \ 4 scan0137 | |
| Request to manufacture one Gearbox Rear Coupling extension for 20/25 Servo Tests. | 4th May 1934 | Box 105 \ 4 scan0138 | |
| Instruction to reline servos on cars 21-G-IV and 4-B-IV with 'roasted' RAD-13 linings. | 26th Jun 1934 | Box 105 \ 4 scan0139 | |
| Request for different cast iron servo linings for 25 HP servo tests. | 12th Jul 1934 | Box 105 \ 4 scan0140 | |
| Requesting different cast-iron servo linings for 25 HP servo tests. | 17th Jul 1934 | Box 105 \ 4 scan0141 | |
| Request to supply and fit parts for 25 HP servo experiments, specifically to incorporate an outboard ball bearing. | 19th Jul 1934 | Box 105 \ 4 scan0142 | |
| Request to make two cork-inserted plates for trials on the servo test rig. | 20th Jul 1934 | Box 105 \ 4 scan0143 | |
| The mechanical efficiency of a Bentley and 25 HP servo motor and its linings. | 26th Oct 1934 | Box 105 \ 4 scan0144 | |
| Servo efficiency tests, focusing on the effect of temperature on brake lining friction and the search for better materials. | 26th Oct 1934 | Box 105 \ 4 scan0145 | |
| Braking system tests, discussing servo types, lining characteristics, and mechanical efficiency. | 26th Oct 1934 | Box 105 \ 4 scan0146 | |
| Test report comparing the performance of different servo lining materials. | 26th Oct 1934 | Box 105 \ 4 scan0147 | |
| Comparative table of performance characteristics for various servo lining materials. | 26th Oct 1934 | Box 105 \ 4 scan0148 | |
| Graph plotting the coefficient of friction against temperature for Ferodo RAD 13 friction material. | 2nd Oct 1934 | Box 105 \ 4 scan0149 | |
| Graph showing the variation of friction with temperature for Ferodo V.M. 30 friction material. | 8th Oct 1937 | Box 105 \ 4 scan0150 | |
| Graph of hysteresis loops for a Bentley Servo Motor, comparing different connection and bearing setups. | 25th Oct 1934 | Box 105 \ 4 scan0151 | |
| Results of servo efficiency tests and suggesting further material trials. | 29th Oct 1934 | Box 105 \ 4 scan0152 | |
| Trouble with the Bentley and 25 HP servo and proposing a modification to make it run cooler. | 2nd Nov 1934 | Box 105 \ 4 scan0153 | |
| The standardisation of fully floating servos for Bentley and 20/25 models. | 2nd Nov 1934 | Box 105 \ 4 scan0154 | |
| General specification for the servo on chassis 21-G-IV. | 14th Nov 1934 | Box 105 \ 4 scan0155 | |
| Experimental Department Report on the efficiency of servo cams and reducing journal friction. | 15th Nov 1934 | Box 105 \ 4 scan0156 | |
| Test report on servo cam efficiency, comparing the standard 25 HP cams with a modified version to assess the effect of journal friction. | 15th Nov 1934 | Box 105 \ 4 scan0157 | |
| Graph showing hysteresis loops and comparing the efficiency of standard and floating cams for a Bentley servo motor. | 14th Nov 1934 | Box 105 \ 4 scan0158 | |
| Tests and modification requests for servo operating cams on Bentley & 25 HP models. | 28th Nov 1934 | Box 105 \ 4 scan0159 | |
| Experimental department report regarding a ball bearing for a brake system servo motor. | 19th Dec 1934 | Box 105 \ 4 scan0160 | |
| Experiments comparing a special bearing with an ordinary ball bearing in servo motors. | 19th Dec 1934 | Box 105 \ 4 scan0161 | |
| Graph plotting the hysteresis of a Bentley & 25 HP servo, comparing special and ordinary ball bearings supporting the inner pressure plate. | 2nd Jan 1935 | Box 105 \ 4 scan0162 | |
| Requesting the manufacture of two additional pairs of servo cams for the Bentley & 25 HP. | 2nd Jan 1935 | Box 105 \ 4 scan0163 | |
| Inconsistency in servo swinging arm poundage, proposing to replace Ferodo linings with oily cotton duck. | 2nd Jan 1935 | Box 105 \ 4 scan0164 | |
| Requesting the fitting of servo motors to specific Bentley and 25 HP chassis for testing purposes. | 15th Jan 1935 | Box 105 \ 4 scan0165 | |
| Deletion of a crinkly plate modification for the 20/25 servo following test failures. | 15th Feb 1935 | Box 105 \ 4 scan0166 | |
| Standardisation of parts for a servo motor, incorporating a ball bridge bearing, fully floating linings, and a spring ring torsional connection. | 15th Jan 1935 | Box 105 \ 4 scan0167 | |
| Cost estimation for extra jigs, tools, and equipment with a cost comparison between an old and new part. | 8th Feb 1935 | Box 105 \ 4 scan0168 | |
| Requesting the adaptation of a new friction method from a Bentley servo to the 25 HP servo suspension bracket. | 5th Apr 1935 | Box 105 \ 4 scan0169 | |
| Use of a Bentley servo suspension bracket on the 25 HP model. | 8th Apr 1935 | Box 105 \ 4 scan0170 | |
| Application of a Bentley disc type friction device to the 20/25 model's balance arm. | 16th Apr 1935 | Box 105 \ 4 scan0171 | |
| Rectifying servo squeaks and judder on a 20/25 model. | 20th May 1935 | Box 105 \ 4 scan0172 | |
| Two faults with floating servo-cams on 25 HP and Bentley models, with a request for design alterations. | 3rd Jul 1935 | Box 105 \ 4 scan0173 | |
| The performance of cotton duck fabric liners fitted to a servo balance arm after testing. | 5th Jul 1935 | Box 105 \ 4 scan0174 | |
| Issues with splined servo linings for Spectre, Bentley & 25 HP models. | 6th Jul 1935 | Box 105 \ 4 scan0175 | |
| Six 'Safeguard' friction linings from Gandy Belting Co. to be tested on a 20/25 HP servo motor. | 19th Aug 1935 | Box 105 \ 4 scan0176 | |
| The fitting of a servo to a 25/30 HP Chassis, 22-G-V. | 1st Jan 1936 | Box 105 \ 4 scan0177 | |
| Proposals for a Servo on a 25-30 HP vehicle, covering bolt clearance and the brake pedal stop. | 15th Jan 1936 | Box 105 \ 4 scan0178 | |
| Requesting the replacement of rivets with bolts on the servo for 25/30 and Bentley models following failures on experimental cars. | 3rd Apr 1936 | Box 105 \ 4 scan0179 | |
| Requesting the replacement of rivets with bolts on the servo balance lever for 25/30 and Bentley models. | 5th Apr 1936 | Box 105 \ 4 scan0180 | |
| Potential cure for servo judders on the 20/25 model by removing a washer. | 14th Aug 1936 | Box 105 \ 4 scan0181 | |
| Follow-up communication requesting a reply regarding an issue with the 20/25 Servo Judder. | 18th Aug 1936 | Box 105 \ 4 scan0182 | |
| Communication regarding the issue of servo judders on the 25 HP model. | 18th Aug 1936 | Box 105 \ 4 scan0183 | |
| Shearing of rivets on the 25/30 HP & Bentley Servo balance lever, recommending immediate replacement with bolts. | 10th Sep 1936 | Box 105 \ 4 scan0184 | |
| List of new and replaced parts for fitting a Disc Type Damper to a 20/25-HP chassis. | 10th Dec 1936 | Box 105 \ 4 scan0185 | |
| Parts list from Section 6180 detailing new, additional, and replaced/not required components. | 10th Dec 1936 | Box 105 \ 4 scan0186 | |
| List of new and replaced parts for a 20/25 HP chassis to fit Disc Type Dampers. | 10th Dec 1936 | Box 105 \ 4 scan0187 | |
| Continued list of new and replaced parts with corresponding part numbers and quantities. | 10th Dec 1936 | Box 105 \ 4 scan0188 | |
| Confirming an increase in factory cost for the Disc Type Damper for the Servo Suspension Bracket. | 10th Dec 1936 | Box 105 \ 4 scan0189 | |
| Standardisation of servo linings for the Bentley and 25/30 chassis, and renaming the Ferodo material. | 24th Dec 1936 | Box 105 \ 4 scan0190 | |
| The standardisation of servo motor mechanism features for the 25/30 and Bentley models. | 11th Jan 1937 | Box 105 \ 4 scan0191 | |
| Standardisation of a servo with specific linings and connections for the 25/30 HP model. | 10th Feb 1937 | Box 105 \ 4 scan0192 | |
| Estimated cost for new tools and a production timeline for the R2 series chassis. | 22th Dec 1936 | Box 105 \ 4 scan0193 | |
| Standardisation of a Dics type damper on servo suspension bracket for the 25/30 HP model. | 22th Dec 1936 | Box 105 \ 4 scan0194 | |
| Estimated cost of new tools included under Bentley Standardisation Sheet X. No. 251. | 10th Mar 1937 | Box 105 \ 4 scan0195 | |
| Standardisation of parts for servo improvements on the 25/30 HP model. | 10th Mar 1937 | Box 105 \ 4 scan0196 | |
| Estimation for the cost of new tools and their production implementation for the 'R' Series chassis. | 25th Mar 1937 | Box 105 \ 4 scan0197 | |
| Instructing the removal of a servo motor from one car and its refitting to another car. | 25th Mar 1937 | Box 105 \ 4 scan0198 | |
| Confirming the replacement of the servo on car 22.G.V. | 1st Apr 1937 | Box 105 \ 4 scan0199 | |
| Requesting two pairs of 35° Servo Cams for 25/30 HP cars to be sent to Paris. | 23th Nov 1937 | Box 105 \ 4 scan0200 | |
| Testing alternative, cheaper materials for the servo drive worm wheel on Bentley & 25/30.HP models. | 13th Dec 1937 | Box 105 \ 4 scan0201 | |
| Complaint regarding inefficient servos on B.II & 25/30 HP models and a recommended fix. | 27th Oct 1938 | Box 105 \ 4 scan0202 | |
| Arguing against the reduction of the vehicle tool kit, emphasizing the necessity of special tools. | 17th Dec 1926 | Box 105 \ 4 scan0203 | |
| Potential reductions to the car's tool kit, with a comparison to Mercedes. | 31th Jan 1927 | Box 105 \ 4 scan0204 | |
| Standard tool kit for the Phantom model for daily versus extended tour usage. | 31th Jan 1927 | Box 105 \ 4 scan0205 | |
| Design alterations, discussing the strategy of using existing parts to minimise jigs, tools and replacement stocks. | 13th Mar 1928 | Box 105 \ 4 scan0206 | |
| Query regarding the inclusion of both an oil syringe and a Lucas oil can in the tool kits for 20 & 40/50 HP chassis. | 23th Dec 1929 | Box 105 \ 4 scan0207 | |
| Considering the inclusion of a syringe in the chassis tool kit for lubrication and maintenance. | 3rd Mar 1930 | Box 105 \ 4 scan0208 | |
| The outcomes of a conference regarding the supply of tool kits for 40/50 HP and 20/25 HP chassis. | 23th May 1930 | Box 105 \ 4 scan0209 | |
| Packing note listing spares and tools supplied with a 20 HP chassis. | 8th Nov 1929 | Box 105 \ 4 scan0210 | |
| Proposed alterations to the tool kits supplied with both chassis types. | 4th Jun 1930 | Box 105 \ 4 scan0211 | |
| Retention or deletion of items from a vehicle's original tool kit, based on feedback from the Inspection Department. | 2nd Jul 1930 | Box 105 \ 4 scan0212 | |
| Reduction of tools in the tool kits for Phantom II and 20/25 HP models. | 26th Jun 1930 | Box 105 \ 4 scan0213 | |
| Reduction of the standard tool kit provided with cars. | 4th Jul 1930 | Box 105 \ 4 scan0214 | |
| Proposal to reduce the contents of tool kits based on customer capability and alternative maintenance solutions for brake squeaking. | 7th Jul 1930 | Box 105 \ 4 scan0215 | |
| Standardisation of Chassis Parts for a revised tool kit on the Phantom II & 20/25 HP models. | 12th Jun 1930 | Box 105 \ 4 scan0216 | |
| Reductions to the tool kits for Phantom II & 25 HP models. | 12th Jun 1930 | Box 105 \ 4 scan0217 | |
| Continued list of car parts, tools, and accessories. | 12th Jun 1930 | Box 105 \ 4 scan0218 | |
| Confirming an agreement on reducing the contents of a tool kit, with specific exceptions noted. | 25th Jul 1930 | Box 105 \ 4 scan0219 | |
| Confirming the standardisation and reduction of tool kits, noting an exception for specific spanners. | 26th Jul 1930 | Box 105 \ 4 scan0220 | |
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