I have a hitch in the bed and cant figure out what the problem is. Its not a turnover ball. Its supposed to pop up with the lever under the fender. It wont move..at all. Maybe you guys know how this mechanism is set up. Tried spraying PB Blaster but that didn't free it. The handle/lever moves but not the ball. Any thoughts? I've looked for an exploded diagram but came up empty. Maybe you fellas have run into this before. Help and comments are much appreciated.