I‘ll jack it up tomorrow and check everything to see if I can find the issue. Honestly, I was questioning the need for pads but the sound it was making is identical to the sound of those metal tabs scraping on the rotors of other cars. What made me think it was something else was the fact that I only heard the sound when turning the wheel and riding the brakes into a parking stall. But then I started hearing it in straight line stops.I'll further elaborate. The screw itself isn't the issue; if the set screw is torqued and the rotor flat against the hub, that means there is a greater issue with the brake system geometry. If the screw is missing and the rotor is dancing on the hub with the wheel removed, yes, proper torquing of the lug bolts should true it.
If there's no inner nor outer lip/ridge to the rotor, there is no need to measure it.