How can I keep my patio umbrella from swinging side to side?

by Tis

I have a 9ft cantilever patio umbrella. It came with the base that I filled with sand no problem. The problem is the umbrella swings from side to side horizontally in the lest bit of wind. After only moments I’m no longer covered in shade and I have to turn the umbrella back towards me. Any suggestions? I’m I missing a part?

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