it is designed for you to adjust the inclination of the base mecanically... like a screw fitting in different holes... however it is not stable and it starts jumping from hole to hole... to 90 degrees.. this is the laptop falling from the base...
It seems an alignment issue of some sort... i have reassembled the unit 3 times and is useless... A friend said he will try to alter the mechanical part to fix it... anyways for what i use it (in bed), i usually limit the angle with my lap... very poor design... dangerous for your laptop.. not safe!!