Ok, Mine has a ribbed solid aluminum rod at the bottom, an aluminum center tube section in the middle, and a stainless section which attaches to the roller tube end. I can tell you that the stainless is very strong.
Last month I forgot to tilt my awning before bed and it rained cats and dogs. In the morning, I found the rear support center section bent in a complete U shape, but both end rods were fine. I had to tweak the stainless section ever so slightly, when I got the new center section, but I mean just a tiny bit. I would recommend the stainless rods if you are having issues with the aluminum.
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