Solid material, but complicated mechanics

The holder is inexpensive and is made of solid material. These are the positive aspects.
Although in the description which is structured rather complicated and sometimes incomprehensible, given the holder does not fit on my ACER device. ACER is anyway a common brand with Beamer. The necessary screws (M3) were procured neither the holder nor the projector case and had only at the hardware store. This was adapter for exotic devices here and screws which are not needed. The assembly is also not so easy.
Contrary to the information in the Prospectus and instructions can not be the inclination really adjusted to the bracket. The connection is absolutely rigid! An adjustment is only gently but firmly on the fully assembled device possible.
I would not buy the part again and rather spend 20 euros more for a better mount.