I always thought the way they did it was so interesting! YOU CAN ADVERTISE UR PROJECTS!
The way it works is the top part of the crane is on a tube, and they make a small chunk of the crane tower go up the tube. Then they expand the chunk of the crane tower and it becomes a part of the tube. Then they make a small chunk of the crane tower go up the tube. Then they expand the chunk of the crane tower and it becomes a part of the tube. then they they make a small chunk of the crane tower go up the tube. Then they expand the chunk of the crane tower and it becomes a tube.
