Id imagine if you cut the head off hopefully the "neck" of the spinal cord is hollow so you can JB weld in a bolt in the chest side and maybe a small bearing in the skull to allow spinning. Idk its an idea.The HD skeletons are not bad for the price but the one major drawback, at least for me, is that the heads are stationary. If anyone comes up with a simple hack to allow the heads to turn I'll be ecstatic!