"You didn't throw it away, did you?" said Lisa, horrified.
"No, its right here in the side pocket," I replied, and digging around in the bag I also found the spring that sits under the trigger. Unfortunately, there's no way to get the button to stay in place without taping it. Lisa taped it back in, and it works after a fashion, but it's never going to be the same again.
What a maroon I am: I $300 camera and I've broken a five-cent part that makes it work and probably can't be fixed. Groan. We'll limp along with what does work.