Cheap twistlock unlocking by rope

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Attach a taut line with a small weight to the standard semi-automatic twistlock in its unlocked position. Pre-charge the twistlock and insert it into the container's corner. Once the container is placed and the twistlock locks, release the rope and weight which will fall down. To avoid the rope clinging to other containers during unloading, ensure that it disconnects from the handle and falls when the twistlock is truly unlocked. After ship loading, secure the rope ends with small weights, then pull the rope to unlock the twistlock.