Well I guess my first question is what did you use to press down on it with? Not sure that it matters but I wouldnt use anything metallic just in case.
Next question would be, did your test produce the desired results? Does it in fact have a spring loaded center pin?(it should)
Finally, are you experiencing any issues with the device?
@defdock The Maraxus has a spring loaded pin, as does the Hammer. Im sure there are more in existence. I will say that the Maraxus was a terrible experience for me, I kept getting a hot switch and after about a day of tinkering with it I decided it was better as a display item in my collection. It hasnt been used since.