Thread:SpiritedDreaming/@comment-24534644-20160601010520/@comment-26397825-20160626024804

The concealed runner and strap combo is sorta easy. Just a cylindrical roll that retracts the strap and has a spring based retraction system on the top on the crook points. As the top ones spread out, the middle ones are draged into place by tiny cables or something, while the bottom centre one stays locked in place. If that makes sense.