I tied a little continuous loops of mason's twine to the unloaded end of the constrictor and prusiked it to the line the constrictor slides on. Before loading the constrictor I'd pull the unloaded end and slide the prusik up. When loaded, the prusik keeps tension on that end of the constrictor. I've also seen people use small O-rings and silicone tubing around the unloaded end of the constrictor to accomplish the same thing.
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