A friend asked me to design a holder for a power board and his Tarot 650 Folding Hexacopter (http://www.hobbyreal.com/es-tarot-iron-man-650-folding-4-axis-aircraft-rack-tl65b02-p236014.htm?source=ProductListAds&id=76813667831¤cy=eur&country=ES).
It uses M3 for the power board. Links to Tarot are by pressure.