If they are assembled like mine, maybe you need to take it apart for a thorough cleaning?Mine's got to the point within 30 mins of tightening the screws that they're loose again. Many trapped fingers in tripod legs later and I'm fed up. It has in fairness had 3 and a half years heavy landscape abuse...but still I'd expect a bit more!
But that's great!... One of the bolts have literally fell out in a field somewhere.
Now I look closer, the hook is actually a ring!...What do you mean you did with your hook? Do you have any pics?