[Thermaltake Shock Headset Loosening problem]

Hello i've got Thermaltake Shock Headset,
My problem is i think, left movable mount (place where L symbol on it) moving to the left all the way up, when right movable mount can limit on the middle and keep sturdy. Left movable object might be loosen up.

How can unscrew and disassamble this and tighten again?

Please look at the picture.