Counterweight Fly System Balance
Required arbor counterweight, out-of-weight amount, and bricks to add or remove to balance a batten (required = (batten + load) x purchase_ratio). A double-purchase arbor needs twice the counterweight; an out-of-weight batten is the classic fly-rail hazard.
Formula and source
required = (batten_weight + attached_load) x purchase_ratio (1 single, 2 double); out_of_weight = required - existing; bricks = ceil(|out_of_weight| / brick_weight).
Theatrical counterweight rigging (single / double purchase), by name.
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