I will not buy me this bracket again. This part is more than fragile. I fummel now to adjust the bracket to a stable point since 2 weeks. Every time they sacked from somewhere despite strong tightening. The only thing that keeps a little more is the lock on the 4 screws on the ceiling mount. The rest is not suitable for heavy video projector. I have a Samsung SP-A600B like I do not find is particularly difficult. Every day when I turn on my projector, the image stays in place. Time bottom left top right times ... etc. etc. I have at hand a gun Knasten be around each time to adjust to if I turn on the projector.
My nerves Nee Thanks are at the end and I will not recommend this "thing". 2 stars gibs only for quick shipping and a for the the projector on the ceiling "depends" or let's say rather dangles ...