The assembly instructions are a bit meager. Is not it. What for the round plate to be ..... ???? No matter .... get rid of it. Later me ...... falls determined to stick to a surface Klatte. Of course I have the uncanny luck of owning a schrumpeliges dashboard with all my vehicles. So this is equal to the endurance test. The holder has a slightly disgusting sticky Schwabbelmaße but quite beastly glued down. I mounted the holder 2 hrs. Prior to your departure. After 2500km ride for days (3 weeks) in black scary hot car under the scorching sun of Spain, everything was the holder harm. Arriving home I dismantled the holder. This was not as easy degree. This part holds as the sow. I almost thought I tear a hole in the dashboard, :-)). The statement of the previous speaker, I can not share ...... the holder not hinterlies trace of an impression. The holder I and 2 days later a different Fahrzeg implanted with whom I am on the road every day. After 10 minutes, the iPhone with the holder as an old cow's tail wagged back and forth ...... but did not fall down or around. Did the holder on the same day about 5 x tightened ...... result was no better. At the next red light I reached for the silver bullet: .... I took the holder compl. off and just threw a shot out of my water bottle over the Miner Schwabbelfuß and sat before switching to green the holder back into place and closed the clamping lever down. What can I say ??? ..... "the holder holds as the sow". Most importantly, however, ... this is only possible with the Michael-Schumacher-water "Rosbacher". With still water will void the warranty. :-)) So people .... the holder can buy for sure.