What is the line that carries the load as the batten is raised and lowered, running through blocks from the batten to the arbor?

• A. Purchase line
• B. Counterweight
• C. Rope lock
• D. Main line

Answer: (D)

In a counterweight fly system, the load path from the batten to the arbor is carried by the main line. This line runs from the batten up through loft blocks and down to the counterweight arbor, so it is the line that actually supports and transfers the weight of the scenery as you raise or lower the batten. The counterweights balance this load, making movement easier. Rope lock is just a securing device, and “purchase line” refers to another part of the rigging used for balancing in some setups, but it is not the direct load-carrying line described here.