Making switch tabs
Typically the rivets on the top holding the terminal in place are the contact inside the switch. I would be VERY cautious about soldering as the plastic will melt from the heat.
Google Automotive Switch repair there are several companies that do that.
Instrument Specialties might be a good place to start
I successfully disassembled my wiper switch from my Dart #2. I cleaned the internals but the part for the push button for the power water squirt button was partially broken and if depressed would make a short to ground.
Also the internals are geared in a interesting way, so if you decide to try taking yours apart GO SLOW take a lot of photos maybe even a video.
I did not follow my own advice and these are the only photos I took :eek: