Bill, if it's that simple a fix, great. And it's especially cool to know you've had your Mustang so long...you "own" some history there.
Even with replaced switches (I replaced one and of course kept it) these guitars have so much sentimental value, and will have moderate cash appreciation as well. Ours are probably in the $870 to $1200 range now.
But the best news is that they continue to be players.
I don't want to unravel this thread but when you get a chance, tell us about your ambitious-sounding build...if it fits here. If not, backline me.
Best regards,
doug