counterweight

Random question: I was on a site tour of a new facility the other day that's still in the concrete-pouring phase, but when looking at the stage house I was told they are preparing for a rigging system that will allow the arbors to pass below stage level into a basement pit.I've only ever...

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Surprisingly, I've never seen it done/done it. Haven't found much in CB about methods, so not sure if it violates rules, but how is this done? There's plenty of material on a standard arbor to u bolt on a piece of steel, but not sure if there's a specific piece of hardware designed for this...