All British Tool Works tools are guaranteed for life.  No receipt necessary.  We will be astonished if one fails and we will ask plenty of questions, but it will be replaced post-haste or a refund given - your choice.  But honestly, that's not gonna happen.

This is text from the factory service manual which can be accessed from http://rrtechnical.info/

It is from the page that is included in the photos.

 

Special tool required:

RH.195 — Front Spring Compressor

 

Description

The front coil springs are fitted with packing washers to suit the front axle weight and the terrain over which the car will operate. The poundage rating of the front springs is between 1650 lb. (747.450 kg.) and 2440 lb. (1105-32 kg.) at 9.550 in. (24.257 cm.) depending upon the model and the weight of the car.
Steel packing washers 5.375 in. (l3.652 cm.) diameter and 0.100 in. (2.540 mm.) thick are available, permitting the effective poundage of the springs to be adjusted with considerable accuracy to suit individual requirements.  These steel packing washers fit on the top of the coil spring and each additional washer will increase the poundage by 14 lb. (6.342 kg.).  The maximum permissible number of washers fitted to any one coil spring is seventeen and the minimum is two.
The front springs are normally supplied with the correct number of packing washers to suit individual chassis.

It is advised that with any front suspension problem, retailers should contact the London Service Station, Hythe Road or the Crewe Service Station, Pym's Lane.

Front Coil Spring — to remove:

Apply the handbrake and jack up the car at the centre of the front pan, using a suitable plate on the jack head to spread the load: ensure that the plate does not foul the power steering cylinder.   Place stands under the stabiliser rod chassis mountings and remove the stabiliser rod link from the side concerned.

Place the compressing tool RH195, through the coil spring until the hook on the top end of the tool engages in an eye protruding from the front cross-member for this purpose.   Compress the spring sufficiently to enable the securing bolts and setscrews to be safely removed.  On S1 cars, there are eight bolts securing the coil spring lower scat to the lower triangle levers and on S2 cars, two bolts and two setscrews.

After removing the securing bolts, gradually release the pressure on the compressing tool until the coil spring tension is fully released, then detach the tool from the eye on the crossmember.

Care should be taken not to misplace the steel packing washers fitted on top of the coil spring.

Front Coil Spring — to fit:

The spring should be fitted by reversing the removal procedure, noting that the top of the spring is ground flat and the correct steel packing washers are used.
Before compressing the spring, place two long pieces of rod through opposite holes in the spring lower seat and lower triangle levers:  these steel rods will act as guides to align the remaining holes.

When the operation is completed and the jack removed from under the chassis, the car should be rocked from side to side to allow the spring to settle into position.

A check should he carried out of the standing height and steering geometry on completion of this operation, referring to 'Front Suspension' for specifications and methods of adjustment.