Advice/feedback needed on Morch UP4 setup

I am trying to set up a new Morch UP4 arm on a new Amazon Model One table. I have no experience or exposure to this set up or any experience with setting up arms and carts since the early eighties. The question I have is concerning the lack of stability of the assembly at the pivot point. Should it be loose? I have put the weights on and installed the wand and it is still very unstable at the pivot point. I realize this assembly is riding on a bearing and that it is really the only point of contact but I can't beleive it is not supported laterally somehow. For instance, if I have the arm in it's base along with the prescribed weights on and the wand installed and I pick it up by the head shell with one finger it rotates, or spins, if you will. I hope this question makes sense, if anyone out there has set up a Morch UP4 hopefully you have seen the same. An advice/ experience/ feedback is greatly appreciated.