Some PushButton I can ear the "sping sound", normal?

[daok]

I bought pushbutton classic from Ultimarc. I have 2 buttons in the batch that do other sound than the other. All other do the "click" sound... but these two buttons is more metallic sound of the metal spring. When I push them, I feel something different. Is there anyways to fix that? I have open the button, move the sping and replace all, it still does this weird behavior. Any idea?

[MrMojoZ]

The buttons that make the spring noises are full of deadly snakes. 

[Ginsu Victim]

Take out the spring and stretch it some. Put it back in, try it, and see how it sounds. Repeat as needed.