If you (with great distance or the "bent pipe" which included small bowls wall bracket) requires the freedom of movement does not have the possibilities TechniSat own produce, but directly to the attachment point is (rod, tube, it is also a square), then On the Pipe Fitting a very good alternative. It is secure and allows the mirror enough adjustment space. The long screws are stainless steel and therefore weatherproof. But you should tighten the turn even the head, otherwise you pull the thread out from the aluminum and must not be, since it is far previously budge! ;)
... And even if you do not often "umhängt", a few stainless steel washers should treat the screws yet, because then the screw heads also work from any material (even if it is very low)
