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Trango Cinch Auto-Locking - Cinch, Trango vs GriGri, Petzl Auto-Locking Feature: Auto-Locking belay devices are designed to catch a fall without any action from the belayer (but they must be backed up). When the climber's side of the rope is weighted, a cam pinches the rope in the auto-locking belay devices. The belayer can deactivate the cam by pulling back on the handle (i.e. when lowering th..