I built it on the principle of those balanced desk lamps (for example google 'Ikea Tertial'). I used wood instead of metal and elastic rope instead of the sprin

I built it on the principle of those balanced desk lamps (for example google 'Ikea Tertial'). I used wood instead of metal and elastic rope instead of the springs. The joints I 3d printed. You have to adjust the spring/elastic tension to fit with the weight at the end.