Quick attach leg for 4mm x 20mm arms

Quick attach multicopter leg, for 20mm wide and 4mm thick arms (taking into account ESC/motor wires on top, and a 3rd slot for sponge legs, like Machine X220 Wizard).
Uses nylon cable ties (max 3mm wide) to attach leg above and below - THIS IS A TEMPORARY leg, not made to be permanent, I designed this to be able to quickly attach a GoPro/ChinPro BELOW my X220, to do some vertical photography / search and rescue, as I'd lost another quad in an area with many boulders and bushes, and with these l