Is there a dial on it you can adjust the tension? i think the lever or somthing on it rotates. I think it looks like a sproket or somthing. Back that out and that will release the tension of that little hat looking thing. Once its backed out you can sit the spring back in there and then tighten it back up. once you have it backin place lock it in place then add the tension.
Those are kinda cool how they are setup. It works similar to a floyd with the knife edge and posts but it locks wich makes it easy to setup. Is the spring yellow?
Got any of dem french fried purtaters?