Ok......glad I saw this post and it probably ain't related, but......an old guy gave me a factory bed liner like that a few weeks ago, but he couldn't remember how you get the clips to work that go one the inside (between the bed liner and the truck and apparently hook to the inside of the rail) so how does that work? Do you install the clips before you put the liner in and what causes them to catch when you screw em down? Do they roatae until the catch or what? Thanks in advance.