Not too sure how well that grip head would go over 1" square tube. I would use back to back Super Clamps. http://www.bhphotovideo.com/c/product/546371-REG/Manfrotto_035_035_Super_Clamp_without.html
I didn't use 1" square tube. I used 1/2 round tube.
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Not too sure how well that grip head would go over 1" square tube. I would use back to back Super Clamps. http://www.bhphotovideo.com/c/product/546371-REG/Manfrotto_035_035_Super_Clamp_without.html
Yes, that's no doubt right but if you use the thinnest grade available the outer diameter of the tube isn't 1/2" it's just under 3/4" http://brassmein.com/tech/conduitdia.htm Home Depot sells EMT.Avenger D200's . They should be fine with 1/2 round tube.
Tube is measured in OD. Pipe and conduit measurements are in ID. Have to watch the semantics.
To some degree. Pipe and conduit measurements are usually a close but not exact measurement of the ID.