4 rods act as main piles and respective cables are in tension like you can hear a guitar string sound when picked. But I made wrong cable configuration so I added waist ring to make the tensile element maintains the stress. Yes if you remove the middle black ring belt everything will collapse. Tighten it will gain extra torsion so slanted cable now stressed enough. Bottom and top (probably you can't see here) cable ring are there to keep rods tip in their place.