Putting Iphoen back together, is mute swithc screwed in?

[apaschea]

ok so i bought a new back to my iphone and a new headphone/volume/powerbutton cable. Now im putting it all back together but it seems that the mute swithc isnt screwed in. There are two screw holes beside it but i do not recall anythign extra when i took it apart.

soes anybody know if the mute button ahs to be screwed right?