On the older colt revolvers det. specials, python etc.,when the trigger is pulled and the hammer falls, the second stage of the hand pushes the cylinder tight against the bolt so there is no play.THe famous colt bank vault lockup. On smiths and rugers there is a little play even when hammer is down and trigger is fully depressed. ON the older colts this rigid lockup purportedly gives better accuracy as the bullet always enters the forcing cone at exactly the same place. My question is how did colt make it such that each cylinder is exactly in alignment with centerline of bore? It would seem that if each cylinder wasnt exactly in line with bore at lockup that the rigid lockup might be for naught as the bullet would then still enter forcing cone off center.Is it always true the centerline of each cylinder hole is = to centerline of barrel with theses older colts???