The U.S. Army has identified a requirement to rotate 20 foot and 40 foot ISO containers during loading and unloading operations using the Army 250 ton crane P&H Model 6250 and 20 foot and 40 foot Line Fast Corp. Model 7127 spreader bars. To accomplish the mission a Bromma Model EH3 Rotator was installed. The rotator is suspended by the double hook blocks of the 250 ton crane. In its present operating configuration, the spreader bar is attached to the rotator by slings. the sling attachments permit torsional oscillations which are unacceptable.