In case you need something to hold your thumbstick to a panel and you don't have the pcb that sometimes comes with them.
It was made for the yellow hall effect ones, but I bet they all have the same dimensions.
First you place the four holding pins inside the little holes of the base part, and then you place the top part that holds it in place. Then you screw the whole thing to the panel. It is not super convenient to do, since you have to hold the panel and the two printed holders in place while you put the 3M screw, but it can be done without much difficulty.
I added the lever too, in case someone needs it.