The only issue is that the screen wobbles a little :-( Can this be easily tightened?

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not without work.

As to the hinge, it depends on the hinge. If it is held together with screws, they sometimes loosen with use and need tightening. If there is pin holding it together like a door hinge, the pin may be slightly bent from abuse.

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It is ridges on a pin and in part of the hinge wearing down.I will upload some pics and perhaps a 3D model later.

*Edit

Ok, here are some hinge pics, though without a good hinge I cannot tell if the ridges in the female side or the pin are the issue. I would guess both to some degree though and it does seem that the matte metal is not as strong.

http://img224.imageshack.us/img224/188/10023022cg4.jpg

http://img95.imageshack.us/img95/2379/10023042md3.jpg

Also, if you have your display removed from the base of the PowerBook try moving the hinges with your fingers. If you can then that hinge has issues and should be replaced as there is now more force being exerted on the other hinge that will result in it's more rapid failure. (that is what happened to my PDQ)

*Edit

Just so you know there are a bunch of metal horseshoe shaped ring like things in the large part of the smaller piece (the one with the pin) and they provide friction to hold the display up yet allow the pin to rotate to facilitate movement of the display. The pin should _not_ be rotating on the side with the ridges! It should be rotating on the side with the metal horseshoe like things.