Sounds like it's been damaged by a heavy hand.  You may need this:
http://www.gowesty.com/ec_view_details.php?id=24166&category_id=&category_parent_id= 

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers
Sent: Thursday, July 02, 2015 4:36 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Throttle switch confusion

As I sit here am looking at the throttle body for my 2.1L WBX. It's
oriented so the manifold is on the left and the big hose for the AFM goes
on the right. That puts the throttle switch towards me and the cam on the
end of the throttle shaft away from me. On 5he plate above the switch are
two allen head screws, a large one on the left that apparently goes trough
the plate with some sort of fastener on it. The screw on the right is
smaller, and penetrates the top plate but does not penetrate the bottom
fiber plate . There is a tiny hole there.

That small allen head screwhead is broken off. I am going to have to drill
it out

QUESTION: Can I drill it. Or will this ruin the eccentric that adjusts the
switch. I am in a quandry as to how to proceed

Thanks.

John