Messed up on my wiper switch. 64 Valiant

WV64Signet said
There should be a washer that sits on the back of the dash panel where it passes through. I just replaced my headlight switch and when I pulled the washer switch back I heard it fall onto the lip inside the dash. Perhaps that is missing?

You are correct. It's a good thing I still have feeling in my finger tips. That washer is thin! Thank s for your help