hood hinge problem,help!

Is that toothed washer missing ? If the hindge is bad the spring tension will casue it to flare sideways . It will scar the fender so people set the spring off.
Raise the hood and check the hindge for excessive lateral movement.
No need to reattach the spring if its going to come back off again.
The easiest way to service the hindge is drive the hindge pins out of the door and set it off. You'll need a floor jack with a piece of 2x4 under the door
and a helper. I throw an old towel over a old tire and lay the door on that interior panel up when servicing door or hood hindges. Good luck