Surfriding Up trim system

I have a ski I am doing a custom build with and going to put an up trim system on it. I have an r&d nozzle but that's all. I need a cable and lever I know but I'm not sure how to set up a return part so when I release the lever the nozzle drops back down. Can anyone help with some advice cause figuring that out is the last part of the puzzle for my trim setup.
 
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