Hi All,
About 20 years ago, I took my round switch apart for cleaning and installed a liberal amount of Dielectric Grease in all internal areas for lubrication and anti-flash. Although this original switch had some contact burning, after this process the switch has performed flawlessly. Based upon my success, I would recommend everyone still using an original switch dismantle and check its deterioration after its years of use. As I have had such good success from the application of dielectric grease, I would suggest others also consider this application.
Just some thoughts,
Ray(64BJ8P1)