gert7to3
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If you have undersized balls (LOL) on your arm, you could apply heat shrink tubing over them. This would increase the diameter slightly and provide more grip for the clamping device.
The downside is that the tubing would have to be replaced periodically and that it could limit the range of arm.
The downside is that the tubing would have to be replaced periodically and that it could limit the range of arm.