So, I tried whacking it against the table a bit, that didn't work. Then I noticed that the end with the threads had risen slightly from the metal tube. So thought maybe it was something to do with that being out of alignment with the button inside. So I was going to just slightly raise it a bit more to see if the button would press, but instead the whole thing comes apart. Now I have the button insides in one hand, and can easily press it, but the wires are no longer attached...If I had any soldering skills I'd be able to fix it.