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I did 4 cylinder around the tube but i couldnot make them attach and not moving since when I applid force it move up and down and I need them fix to the tube

Question asked by Mohamed Rabie on Jul 29, 2013

I did 4 cylinder around the tube but I couldnot make them attach and not moving since when I applid force it move up and down and I need them fix to the tube.

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