When you build up a rolling tower a good start is half the work. It can be tricky to get the first two frames erected without help, because the brace is turning around the rung. There is a solution for this problem.

The APW and HT frames are provided with two gaps, a security gap and storage gap.

The upper gap is the storage gap, you can leave the security clip in there while dismantling the rolling tower. It can stay there when you don't use the rolling tower. When you build the rolling tower up you have the security clip immedeately at hand.

Secure the building frames by sticking the security clip trough the bottom gap.