I tried to use this to lift a steel I-beam 12 inches off the ground. The beam was 1400 pounds, I was only trying to lift one side 1 foot, so less than 750 pounds. before the bar even started to move. After using two other pulleys to get more mechanical advantage, I moved it 1 inch instead of 1 foot and it felt wildly unsteady. Using a simple piece of wood and a crossbar, I was able to raise the beam 6 inches at a time with little to no effort. With a 6:1 mechanical advantage, I had to lift about 120 pounds. With two extra pulleys if it were 7:1 (1 was just a change of direction) either the rating is too high or the rope is so weak it couldn't support the weight. Again I raised 1 end only to get a block down.
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