When you want to lift or pull more than your own strength will permit, or when you want to make a heavy lifting job a little easier, the rope tackle is a device that can be used.
The idea behind a rope tackle is similar to that of a tackle using blocks and pulleys. In a rope tackle, one lead (end) of the rope has to be fixed. That is, it has to be anchored around a spar or tied through a ring or other piece of hardware that doesn’t move.
Follow this link for a full description with diagrams and illustrations: ROPE TACKLE FOR PIONEERING USE
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Step 1: Form the Fixed Loop
Start with a Butterfly Knot in the desired position along the standing part of the rope.
Step 2: Use the Fixed Loop
Step 3: Tighten the Rope
Step 4: Secure the Rope Tackle
When the desired tension is put on the line, with one hand, keep the line taut, and holding the bight in the other hand, use the bight to form a half hitch around both tight lines.
Step 5: Maintain the Tension
As the half hitch is secured, maintain the tension on the line by pinching the standing part, making sure it doesn’t slip.
Step 6: Dress the Half Hitch
Still maintaining the tension on the tightened lines in the standing part, cinch the half hitch up close to the fixed loop of the Butterfly Knot.
Step 7: Finish the Rope Tackle
As an added measure, tie another half hitch around the tightened lines. All excess rope should be coiled under the knots.