Some of the mouldings on StarChief and Bonneville have a stupid
washer type nut witch is hazard for the pin and a real trick to take off.

Sometimes the hood letters have the same type of washer nut.



The rear fender lower outer panel have those nuts and front roofrail mouldings.

On a 3/8  nut I weld on a thick washer and grind to two notches in it.
A socket of 3/8 is good corse the nuts on the other longer outer
panel mouldings and shields are also 3/8. 

It Is still i tricky business to get those stupid things of so my rekomendations
is not to use them again use shetmetall nuts.