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The problem is a bad design with too much leverage on the clamp due to the length of the tube.
There are a couple things you can try. You probably noticed that the device has less holding power in the direction of the open edges of the clamp. Rotate the tube so the solid edges of clamp point toward the direction that you want the maximum holding power. Unless your unit is worn out, you should be able to lock it down in that direction without using to much muscle.
If your ball or clamp faces have become too smooth, you might try wrapping the ball with something like a thin piece of rubber or even some sturdy rough fabric.
Bob
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