Hi,
I have some Wico joysticks that are around 12 years old. The contacts are not great and don't work 20% of the time on some of them. What is the proper way to revitalize the contacts. They appear to have a black coating on the contacts. I remember I used to use sand paper, but that makes it worse (only lasts a short while), at least that is what I remember from a Tempest game I used to own. I didn't want to make that mistake again.
I was hoping not to have to replace with micro switch style joysticks.
Any help appreciated.