RIGGER: Gulf of Mexico Platforms/Vessels- Offshore. Assembles rigging to lift and move equipment or material on construction project. Work locations may vary (offshore). Duties And Responsibilities. Selects cables, ropes, pulleys, winches, blocks, and sheaves, according to weight and size of load to be moved. Attaches pulley and blocks to fixed overhead structures, such as beams, ceilings, and gin pole booms, with bolts and clamps. Attaches load ...