If you have a budget friendly lighting truss, like a Griffin triangle truss, your tubing is only about 1" to 1-1/8" in diameter, and you will need O-clips, but good luck finding clamps that small, which work.
This is a one piece solution, rather than a two piece split bushing, and allows you to use a larger 1.5" clamp. Those kinds of “O” Clamps are pretty easy to find on most marketplaces.
This way you can use better clamps with thinner truss
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