heres a pic from the swayaway website:
"torsion bars. These units can be welded into a rear torsion housing or can be ordered with your new chassis. The removable adjusting arms are manufactured from alloy steel and are heat treated to full strength. Adjustment is as simple as turning a screw, one for each side allowing easy changes in ride height and cornering weights. These units are available in the strong standard design or the stronger King Kong racing version. Our 40 Tooth Torsion Center is designed for replacement of that
worn out stock center or can be used in new custom car construction where adjustability is not needed. Welds into place. "