Hi, just about to install a motherboard in this case, and i notice that the middle standoff can not be screwed in to, to secure the board to case, is this correct ? i want to fit the heavy noctura dh14 cpu cooler(weights like 4lb), but am worried that because the centre standoff is not screwable, it might warp the board ? am i worrying to much, and is the centre standoff meant to be non screwable ? thx