too short and doesn't stay on rail

I wanted to hang plants up high on my new deck. At maximum height, the hanging plants were not much higher than the railing. We tried to use them anyways, and could not find a way to firmly attach them to the deck rail - there simply is not enough overhang on the bracket to keep the plants from falling and smashing on the ground below within hours. It seems very sturdy, but only suitable for birdfeeders or windchimes. The adjustment screw has rusted within a month of being outside.

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