This is the so called script to have the Golden wrench weapon (secret but no so secret lol)
Video here: http://www.youtube.com/watch?v=ynCewByoJHg&feature=related
IT CAN ONLY BE USED IN OFFLINE, unless some server have this.
HOW TO GET IT:
Link to the thingy: http://www.mediafire.com/?nkb5rjztzw2
You must put in Steam/steamapps/USERNAME/team fortress 2/tf/scripts/items
This will make your Natascha disappear and your Golden wrench can be used.