Not suitable for race bike, holds out no vibration, but vibrates violently.

I have now 2 crumbles of those things, every time connected to an outlet of the mobile phone, including plate on asphalt at full speed. Luckily the cell phone is nothing happens. The construction is provided unnecessarily with predetermined breaking points. The not exactly square interface onto the support has two grooves, so that remains little supporting material at the points. Unfortunately, the groove must be inserted into Lämgsrichtung by the cross standing seam just before the insertion, because the plate is not otherwise dranzukriegen to the holder. Vibrations now shaking the 4 individual tabs on the sides by, sooner or later the breaks. My first copy has 300 km (in the phone holder) persevered, the second 100 km. The second unnecessary breaking point is the fact that the holder is not centered under the plate, but about the removal ratio 1/3 to 2/3. This ensures on the longer side of the 4-fold vibration forces, and in general an imbalance. Why not simply recording attached centered?