What should be used for each 24" of counterweights stacked on the arbor?

• A. A safety pin.
• B. A spreader plate.
• C. A rubber mat.
• D. A locking collar.

Answer: (B)

Spacing and stabilization of counterweights on the arbor is essential for safe, smooth operation of a fly system. A spreader plate sits between sections of weights to distribute the load evenly and keep the weights from rubbing against one another as the arbor moves. Placing a spreader plate every 24 inches of stacked weight helps maintain alignment, reduce binding, and preserve balance, making it easier to raise and lower the battens safely. Other items have different roles: a safety pin is a secondary security device, a rubber mat isn’t used for this purpose, and a locking collar secures the end of the weight stack rather than acting as a spacer between layers.