Improve rigidity for standard EMT you know.... wood. A 3\4" dowel, sanded if necessary, would for. Rout a groove for wires if necessary. If no one has tried it, I'm your huckleberry

[highprobability]

Well, couldn’t find the thread but here is a link for those interested in reading more “Science” as it applies to tube selection.

A primer on stiffness

TLDR; A tube’s stiffness goes up with the 4th power of radius, but weight only goes up with the square. For a LowRider build, the 1.25" x 0.49" DOM steel tube from speedymetals.com should improve stiffness and reduce weight. I’ve been reading the forums the past few days and thought I would chime in. My background is as a Mechanical Engineer and I hope there are some things I learned and applied in my careers which could be useful to this incredible community. To paraphrase another poster, th…