Guys - I am replacing the target switches on my Magic City. There is a wire that should be soldered to the switch - at least the original switches were like this. I can't get the solder to stick to the switch mounting metal. It may be plated or coated with something. Do you sand or grind the new ones? The new switch DOES have a third terminal (original had two). Can I use the third one to ground the switch? Type of switch I am using is below (yes, I know this is not the stock switch, but those were out of stock).
Target_Switch (resized).jpg