How can I stop the powerhead from moving?

[Drouse]

How can you stop the Tunze from moving?
I have recently bought the Tunze Turbelle. I attached it to the side of the glass so it points straight down the length of the tank. Due to the natural movement of the unit it will swings 75 degress to the side causing the sand to be blown all over.

How can these things be stablized better? The plastic attachment piece and suction cup seems cheesy for a 240.00 powerhead.

 

[rvitko]

You need to make sure the teeth on the attachement are firmly pressed together.