To prevent the tube from rolling, insert small wooden wedges between the tops of the lead cylinders and the tube wall (one on each side) or place a cross of wood between the tube and the steel block.
Da preprečite kotaljenje cevi, vstavite majhne lesene zagozde med zgornjim delom svinčenih valjev in steno cevi (eno na vsako stran) ali namestite leseni križ med cev in jekleno kocko.