tighten allen head screws
I have them so tight I was afraid they would break. I didn't think it made the arm joint any stiffer. There is a black plastic U piece the arm is held by, I think they may have shrunk over time and weather. They appear to be glued on. I have wedged a black zip tie between the arm and the black plastic u and it held for a few months, looking for a better fix.
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