The apparatusmovesbetweenan extendedpositionproximate thetirebuildingcoreanda retractedposition that does not obstruct the tire building core during subsequenttire construction.
The core idea revealed to Escriva in that 1928 vision, and unfolded in subsequent stages of Opus Dei's development, was the sanctification of ordinary life by laypeople living the gospel and Church teaching in their fullness.