So for those who may either not have the parts, or like I was, not sure how they fit together, I have laid out the following photos with a brief description.
But should you not be sure or have a question, please ask.................................
The entire hand control and horn assembly is basically several plates, on a tube, inside a tube, inside a tube.
The outer tube slides inside the steering column, and is held in place by a clamp at the bottom of the steering box. As the steering wheel turns the tube and the base plate remain static.
The hand throttle control is attached to the intermediate tube.
The advance / retard lever is attached to the inner tube, and has a cradle that the live side of the horn wire is connected too.
These are the parts that make up the horn mechanism.
The springs and insulators inside are used to line up the spacer plate, and then removed.
The horn button sits on top of the large spring (see photo 5 )
The horn cover plate is then fitted with the 2 screws, insulators and springs.
And screwed to the base plate
The final assembly
Points to note
1. Ensure there is sufficient initial lubrication between the 3 tubes.
2. As the horn wire running through the steering column is always live, ensure it is well insulated.