DD - Here is my take on the instructions you posted from mbz.org, but first take a fresh look at the photo I POSTed a short while back [in POST #141]:
http://www.peachparts.com/shopforum/attachment.php?attachmentid=38850&d=1165336744
I believe that first [with the engine shut down], you need to make sure that your VCV-to-Throttle linkages are adjusted for " max throttle " leaving only ~1mm between the VCV's " tang " and the metal stop pin in the body of the VCV.

Then you place the 20mm dia. disc over the metal stop pin [ on the right in my photo ]. This I believe simulates the idle position. Start the engine and [IF necessary] close the throttle to where the metal " tang " contacts the disc and hold this throttle position [possibly a fast idle] with a bungie cord or other means while you make the internal adjustment to the VCV parts under the plastic dome.

Brian - If you are out there and can confirm whether we are on the right track in our understanding of both the external and internal adjustments for the VCV... please jump in here!

Again "DD" I never had to adjust my VCV in this fashion for I was able to get it to function by varying the vacuum input with smaller orifices. I wrenched my back out doing a dashboard dive while working on my Son's MBz so I canNOT bend over the engine compartment to try and follow this exercise up close on one of our cars!

Which raises the question "DD"... have you found the vacuum diagram for your car and do you have the restricted orifices [if ANY] installed as called for in the diagram. ?