For the Innovative Assembly method “INIRA” we have a special tool to adjust the rack joint. You can find further details here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-79gnJagXWvY.html or on our Website: alpha.wittenstein.de/rack-assembly . In case of the standard assembly we recommend to adjust the rack with cooper stick and hammer.