Hello Hopeless,
Don't twist the arms on your fixture. All you will do is possibly pull the wires apart. The proper way to tighten the pieces is look where all the arms of your fixture are connected. That part is called a cluster. To access this piece you might have to take a lot of your fixture apart. On the inside of this cluster there should be nuts that hold the arms on to the cluster itself. This is where you need to tighten. And right is right when you start tightening the nuts. Definitely not any easy job depending on how elaborate your chandelier is, but this is the right way to tighten the arms. Good luck!
Andy
June 2008