Yesterday my beloved 30" Apple Cinema Display slouched over and no longer holds a tilt. I tore into it today and took the spring assembly out of the stand but couldn't find anything wrong. I expected the spring to be sheared or something. I've got a towel lodged in there now to tilt the display up a bit so I can still use it. Any ideas on how to fix this? Haven't found much of any discussion on this with a couple of searches.