Send me an email at hjarrett2 at
cox dot net. If you have a picture of the broken part on your mag switch I may have a replacement switch part. There were different back plates that weren't always interchangeable even though the front of the switch looked the same. Let me know about the friends broken one too. I have a way of using broken switches with a modern key switch behind it that keeps your panel original looking with a key switch for function. Works really well and could salvage yours too if we can't fix it.
Hank