I've picked up one of the highly rated Akasa Nero S CPU coolers, and I'm using it on my X58 board. I need advice on how much to tighten the bolts into its back plate. It uses 4 bolt-thru-spring things to screw into its back plate, like this freedom tower. Only the last 1/4" of each bolt is threaded, the remainder is a wider smooth shaft to fit the spring. Obviously it can only be tightened up the threaded section anyway. Should I screw it all the way? The installation leaflet doesn't specify!