Mounting Starball to a "T" truss

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Yep...

That's the way I do my Sunrays. Put an "O" clamp on only two opposite corners of the fixture. I've hung mine upside down on occasion and they work just fine.
 
That's the way I do my Sunrays. Put an "O" clamp on only two opposite corners of the fixture. I've hung mine upside down on occasion and they work just fine.

What Tyrone says... works like a charm for me as well. Make sure you have something on other side to balance it out, even with an angled support arm.