The coil return spring is probably broken, on the first 90 deg bend, there ain't no real saving it you know.
You can pull apart, and pull the busted bit out and re-bend a bit of the spring so it fits in the retainer, but it's not very sucesful.
Anyway if your going to pull it apart very carefull does it. them springs even when busted., are a loaded coil and will slice your fingers Etc when released. Ouch been there once or twice.
In other words a new spring is in order me thinks.