Headlight switch replacement 64 malibu

[oldguy64malibu]

The new switch that I got from Napa does not come with a new nut. Looking at Year 1 catalog on-line the replacement nut they show that is like the one I am fighting with they say is for a 66 Chevelle so I gues at some point in time the switch has already been replaced. So, I guess I will order the new nut (for a 66) and the nut removal/install tool. I am getting out the drill and looking for a sharp drill bit.
Thanks