I have started using Wynns lead substitute.
The reason I selected it was 1, it has a measure so you can put in the correct amount, I never like the 1/2 bottle per tank idea. And 2, it has a fuel stabiliser for keeping the fuel fresher.
Probably...
Have made a rudimentary bush from a bit of diving stick, it’s hard polyurethane type material and fits very snugly over the ball. Will file it up neatly tomorrow and reassemble! Should do for a while and hopefully stop that bloody awful stick rattle
Black wire in the light fitting through the wing to the engine compartment, and earthed via a ring terminal and bolt to the radiator panel. I think. I've augmented mine.