77 Sovereign couch / bed trouble

[parrotheads]

We just bought a 77 Soverign and we noticed that the couch doesn't really lock down when it is folded down like a bed. It stays low in the center fold. When you try to lay on it, you roll toward the center. Is this supposed to lock in place or is something sprung on it?

[balrgn]

Can you post a pic, sounds like something is missing on the rails..