Setback and Swung Rear End

Both Setback and Swung Rear End were measured and corrected on BC7 SUBARU Legacy LSi US model yesterday. Deeper consideration for long time took me the entrance to solve this problem how to measure actually on the vehicle. Putting an adjusting jig on the hub circular end surface made it possible to obtain 4 terminal point on the ground. Later procedures were performed relatively quickly after the problem, what is the terminal point to measure?, how to measure in what condition?, how to countermeasure it? , how to know the result and how to judge? It goes without writing that very good sense of drive feelings was obtained after that with shoulder and back muscles pain this morning in exchange.