The present invention relates to a twistlock assembly for securing a cargo member to a cargo receiving arrangement. The twistlock assembly comprises a twistlock and a base member. The twistlock is adapted to be at least partially inserted into an opening of a cargo member. The twistlock is adapted to assume each one of an unlocked position and a locked position, wherein the cargo member is prevented from being disconnected from the base member when the twistlock assumes the locked position.

The present invention provides an alignment device for aligning a corner-casting during installation. The alignment device comprises a body adapted to fit within a corner-casting aperture and to engage with the edges of the aperture with a friction fit, wherein the upper surface of the body comprises a visual guide. A kit and method of installing a corner-casting are also provided.