Great idea, hope it works, but - -
It looks as if they used a multi-strand, elastic line for "safety", which is a wise idea. Those are an old idea for "dymanic" braking of falls.
And, my miserable little monitor shows a faint line through the center of the safety line which is always taut. That may be just a minor safety line which should always be taut, or it could be 1/16th cable which is always holding the thing up.
Or the line could be an artifact of my monitor.
Hope the thing works.
Arf