There are several ways to make sure that the threads will not come apart. There is a type of Loctite that WILL NOT come apart unless it is heated. Another method is to physically stake the first thread of each fastener. This is an actual physical deformation of the thread. The end result is like if you have ever try to remove a nut from a bolt that has had the threads have been peened over, pretty much impossible. From the looks of the enclosure, this could be tougher to do unless a special tool is developed, but I am sure this could be done. I am sure that all of this was taken into consideration when the skeletons of these speakers were designed and built.
