The entire design is suspect to me, having a threaded tube of that thin section does not inspire confidence to begin with, then adding that its rolled from flat stock, and longitudinally welded takes it to plain scary. For all the work needed to roll, and weld, then finish the tube, it would be easier, and less expensive to make it in one piece from bar stock on a machining center. Sorry, no old retired Blacksmith stamp of approval for this thing.