i dont see anything strange with the spring on the back...
now..
let's see on the tremolo ... the tremolo stays in its place because of the two post bolts.. and u can play the whammy because of that bolt's role as a pivot point for the tremolo... if one of them move from its place / damaged / the wood where the stud stand is loose .. u cant play ur whammy again right?
now ur problem is... u cant play the whammy at all...
ok..
i think the main problem is your bolt post on the right.. is not in proper position .. looks like it was damaged or crooked, maybe loose from its place ...
maybe... >>>
* have u ever set up ur post stud height?? (the bolt which keep the tremolo on its place) maybe u feel that u wanna get a low action more and u keep screwing the bolt post down...
and unfortunately u didn't notice that the bolt post is in its lowest position .. u keep screwing down .. the wood where the stud housing were planted is begun to loose.
WHY??? because the stud housing have a ribs on its side to retain its position when its planted on the wood .. and preventing it from rotating when u setup the stud bolt's height... and when u keep screwing down , even though its in lowest position.. the stud housing it self will begin to move as u turn the screwdriver.. >>
it would loosen the wood where it stand because of the ribs were forcefully moved/rotated as u rotated the screw ...
got what i mention??