I had the same problem and have just fixed it. The following post has all the information you need. Note that you need a T20 screwdriver to undo the 2 screws on the underside of the cowling and a T10 to undo the 2 screws holding in the indicator stalk.
Here is the post:
http://www.howtomendit.com/answers.php?id=5359
Good luck
Peter
March 2009