This thread is five years old, but to answer the latest question camber and caster are adjusted on 124/201 models with the "cam bolts" that attach the control arms to the chassis. These cars are a "high caster" design, nominally about ten degrees. The front cam bolt primarily affects camber and the rear caster, but there is some interaction.

Since my '88 190E 2.6 is more front heavy (about 57 percent) than my former '84 190E 2.3 (about 53 percent) it exhibited more understeer, so I adjusted the front alignment for maximum negative camber and positive caster, equal on both sides, within the range of adjustment, which yielded negative 0.75 camber and 10.5 deg. caster.

I did the alignment myself in my garage using an inclinometer and string. Later I got the dealer to put it on the alignment rack at no charge, and their numbers were within .05 deg. of what I measured.

It's been that way ever since with no unusual tire wear, and understeer is much less than when new.

All that caster should yield good "steering feel" and very strong "returnability" of the steering wheel, but it has a downside... SHIMMY! That's why these cars have steering dampers. It's a high pressure gas (DeCarbon) type, and when it fails the car can go into a violent shimmy at about 55-60 MPH. I'm on my third one with only 85K total miles on the car, so it's as much about time as miles.

Fortunately the damper is relatively inexpensive and easy to swap out.

Duke