Both contacts consist of "brushes" with "bristles". I think I probably damaged the one side whan I removed it. The conductive plastic track is a very reliable setup as it's in all of the MAF sensors that Bosch used in their "L" jetronic fuel injection. Including most '80s British Leyland / Lucas products. I think the exact number was a bazillion and six.
The wipers on these units is a copper half-round at the end of a piece of stainless steel.

Other than that, what you said!

(you did misspell weak)

Collins
Rear wheel bearings next weakend!