what holds the hood spring mechanism on the pin?

krazykuda said

it's supposed to have one of those flat spring washers. (I forget their name) they are also used to hold drum brakes on.

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I can't remember the name either, but a wavy spring washer and then a flat washer so there won't be any rattles from it.
Then press the flat washer down on the sring washer and put the cotter pin through it.
Quiet, reliable and simple.

Maybe even a flat nylon washer behind the bracket against the body so it doesn't scuff it up.

This style was the original and is called either a push nut or pal nut.