How do I brace a loose staircase? All the posts wobble from top to bottom. The small posts in the middle are a circular spindle that comes to a square. The square area then comes to a recessed dowel that sits in a hole in the step. All of these dowel/hole connections are loose. The big post at the top and the bottom of the staircase are also loose. The connections at the top of the bannister seem OK. How do I stabilize all this? --Appreciate your help.