try this ..
it's 'cheating' but 'might' get you the result you need.

What I've found is even when the allen screw loosens properly, and the
eccentric adjusting feature works..
sometimes..
it still won't adjust to the correct setting.  I aim for contact at
closed throttle and it uncontacting 'just off' idle.

I've had to bend the little metal tab thingey that the cam pushes on.
Like with a needle nose pliers.

I don't think there's much danger of breaking anything .
I've done this maybe 10 times always with fine results ..

though I've not had to 'trial and error' to get it right ...
I've only had to tweak the metal tab thingey in order to be able to
reach useful adjustablilty.

On 7/2/2015 1:36 PM, John Rodgers wrote:
> 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
>