Momo Steering wheel horn button question

[Spectre23]

I posted this on frshalloy as well. Don't worry, I am not asking how to wire the button. A search found plenty of people asking that. My problem is I am wondering if Momo didn't send me all the parts. I have a Momo Race steering wheel, horn button, little metal wire spring thing, horn button trim plate, and 6 botton head capscrews. I know the spring goes on the inside of the horn botton to hold those 4 tabs out. However, my horn button falls right through the steering wheel and the adapter. The trim plate keeps the button from falling out toward me, but there is nothing to stop the button from falling into the adapter when you push on it.

Is there some piece I am missing??