Boat Hoist Sway Dampener Control Against Waves and Wake. It works like a counterweight system — the sway is resisted by the weight box through the pulleys.
Need: 2 pulleys, rope, box of rocks, screws, tools
Mount the first pulley on the swaying object.
Mount the next pulley to a spot near that doesn’t move
Thread the Rope to tie one end through the 1st pulley on the swaying object, then down through the 2nd pulley.
Attach the weighted box to end of the rope, allowing the weight should hang freely without touching the ground.
Add or remove rocks to adjust to the resistance.
If there is a wind strong, you near a heavier box.