Neutral Safety Switch? Transmission Interlock Switch?

I can’t really explain the difference but the neutral safety switch prevents the starter from operating unless the gear shift is in neutral or park. Otherwise the car would move right away when the car was started. The interlock switch may be refering to the switch that prevents moving out of park unless the brake pedal is depressed.

For the steering lock, inside the hub of the steering wheel, where the turn switch stalk goes in, is a 3-4" sheet metal pin wheel with slots all around it. When you turn the key off, a button pops into one of these slots to lock the wheel. I’d have to look at a picture of the key mechanism but I assume there is a device that pushes that pin up in place when you turn the key and also does not allow the key to turn until the button is released. That’s that part that must be sticking and needs replacement or lubing I would think.