toldfield

You might try here https://kelvedonlotus.co.uk/product/hydraulic-brake-light-switch/ It appears to be the same as an Elan S3 switch. tom

Black Goo. I use a clean rag dipped into a tub of dry corn starch to remove the black goo. It soaks it right up and it comes right off. I would guess that any dry powder, such as flour, would do the same. tom

You might look into Keith Franck's research and jetting at https://vintagetechnologygarage.groups.io/g/sidedraft You have to register to access some of the information but he has essentially reinvented the jetting for Weber carburetors. tom

The polisher folks here use for aluminum, such as an Airstream trailer, is a Cyclo. They are expensive but do a great job. https://www.frasersaerospace.com/product/cyclo-6-ce/

Perhaps when the rain stops and the roads are rebuilt we can gather up a bunch of California 7 folks and do this drive.