A few questions.
1) Did you install the screen or was it done by the service person? My Autocord uses a two part screen (ground glass + Fresnel). So a direct swap with the Oleson screen will shift the viewing focus since the new screen is a single piece;
2) Normally, the lenses are adjusted to the infinity position using a collimator. So the lenses are adjusted to the scale, not the other way around. Adjusting the lenses requires removing the front plate. The scale is usually for indication only at the closer distances. However, a 10cm error is a large deviation;
3) How are you measuring the distance? It should be from film plane to subject.