/diy/ - Do It Yourself

Does anyone know how this chinese thing works? It got 3 knobs, and ive been turning them at all different settings but nothing seems to work. What am I doing wrong here? I was only once able to use it but I forgot the combination in which it allowed it to work. I feel like cracking a safe or maybe the rod or device became defect. I thought 3 nobs should give more options but instead it made everything harder for me as a noob. It got dust all over it since I tried using it twice and last time failed so it does nothing rn.