Simple slide lock

this is what i came up with to eliminate the manual placement of individual twistlocks on all four corners of a container while suspended on a crane. no need to insert and turn by hand. four of these bolted on the pavement acts as a magazine for twistlocks. as the container is lowered in place all four locks will be held in place by the ball bearing locks. (blue ones) it can then be hoisted upwards taking with it all four locks (now on standby mode) they will only be locked in place when the container is lowered onto another container. as the wedged part of the lock comes in contact with the side of the hole on the corner casting. to secure the locks, just push and turn the red colored knob.