I can't see where there is an adjustment screw. Mine is slightly out of spec. Can somebody ID the adjustment screw from this pic?

http://www.pelicanparts.com/techarticles/Mercedes-190E/44-WATER-Replacing_Your_Heater_Core/images_small/pic05.jpg

I have no idea what this is nor do I know anything about this specific car...

With that said, to the right of the hand is a black pod, then yellow sticker, then white piece of plastic...

It looks to me like the piece of metal going into that white piece of plastic could maybe be screwed in/out to shorten or lengthen it?

Got it figured out. The FSM had the answer. It's a 5mm bolt on the spring part. I turned clockwise and voltage increased to the expected range (around 2.5V on min) and increased a little on the max heat (to about 0.9V) but remained in spec. I guess it just needs to be tightened a little after 25 years.

I used a 5mm socket with a long extension and a taped up swivel socket to make it more like a wobble socket. A long screwdriver helped me push the insulation up. I went through the antenna switch hole with the socket. This is different than the older version 1 setup described in the programma write up.

I took pics with my phone, but can never seem to be able to upload pics here.