Adjustable Phone Stand for Rods

When working out at home, I typically play YouTube videos as entertainment, but I couldn't see what was playing when using my machine. As the machine I used was made of rods, I designed a phone stand that could be used for viewing purposes with rods up to 2.5 inches thick. I included a screw and nut to allow for the stand to have a tighter fit. Ideally, this model would be constructed with a strong and stiff material, like metal, to maintain a firmer grip, unlike PLA, which has a weak grip and is flexible. Dimensions of compatible phones are up to 3.5 inches wide, 6 inches long, and 0.5 inches thick.