First the background info:
I am installing an oak railing along our livingroom stairs (it used to be a plaster 'half wall'). I have installed the newel posts using 5/16 x 4 1/2 inch lag bolts (4 bolts per newel) and the hand rail using store bought rail bolts. The hand rail is about 10 feet long. I have not yet installed the balusters, which will have to be angled at each end in order to secure them to the handrail and to the runner (I'm going into a runner and not directly into the stair treads.).
Now the question:
I have noticed that the newel posts seem to flex a little when I apply some heavier force to them (say half my 200 pound body weight), and of course the whole handrail follows. This can be as much flex as say 1/4 inch. My question is, will the balusters lend any support to this; is this a normal amount of flex; or do I need to do some re-work before continue on? Any advice would be appreciated.