New member, old man, new question!

Don't expect to save the "push nut thingy" (a technical term). Better to assume that it will get trashed and be ready to get/use a new one. Don't be concerned to get the push nut tight against the hinge and body, you need some play for the arm of the hinge to lay flat to the side of the hood. The push nut just keeps the hinge from falling off when you are mounting the hood and if you ever have to take it off and on again.