I have one of those cheap aluminum flag poles because I don't want to spend $1200 on a high dollar one. It uses 2" pipe sections and works pretty well, but it will bend in high winds. I used black iron pipe inside of it for several years and it worked pretty well, but in our last storm with 70-80mph winds, it did bend and the black pipe broke at the junction (2 10ft sticks). I'm looking for a replacement for the internal pipe that would be stronger. Local metal place recommended sch40 1-1/4" in a 20ft stick but I was thinking maybe some sort of roll bar tubing or similar. I'm not that familiar with the terminology or naming convention of the different metals. I can do up to 1-3/4" inside the aluminum sections. What would be a good choice for this?