it is only really temporary. The door check frame will bend out of shape again. And, so will a new one eventually.

Scroll down this thread on benzworld.org to my post titled "Fix for clicking/snapping door checks."

http://www.benzworld.org/forums/w140-s-class/1203330-knowlege-base.html

Alternatively, just put in a new door check. They're not that expensive.

Brett