Am unfortunately failed during installation. In the side frame the heads of screws come in. But they are too long, they collide with us with the plastic from light shaft. (But he is on the verge narrower.) They can not be so easily replaced with purchased bolts also, because they have 4 square heads of the right size have to stay sane in the bar. Now I have time to ask acquaintances if someone can shorten screws. I lack the tools to do so.