In
the counterweight fly system sheaves help guide and direct the
wire rope cables which support the
batten and the
arbor. Most of the
sheaves in this system are anchored to the
grid. The sheaves guide each cable from the arbor, across the grid, and down to its respective pick point on the
batten.
A sheave which changes the direction of a cable is known as a mule block.
Part of the Stage Rigging Metanode