What made it difficult?

Comparing XH200 OPEL B-Vectra with SXE10 TOYOTA Altezza that was wheel alignment adjusted yesterday on the straightness and the steering centric stability, there is some room to be adjusted on thrust angle a bit, so is the first impression of B-Vectra this morning driven after 2 weeks interval.
I'll check and do that during coming lined May holidays.

Over 10 years experiment and research on wheel alignment and axle constructive geometry might have come to an end these day so I feel.

What made the research difficult are the followings:

Viscoelastic properties of butyl rubber in every hinge bush.

Hysteresis in everywhere of moving portion.

Rebound performance of butyl rubber containing with residual distortion.

Viscoelastic resistance of lubricating oil in everywhere.

Spot distortion on tire outer specific surface while the measurement.

Inversion of the steering characteristics of habit at the speed of over 60km/h.

The different result from the prior imagination required me some period of time to be proved scientifically, but tremendous important things were obtained on the way that had been impossible if I had not chosen the way.