(94 K1500 GMC Suburban SLE)I found the star adjustment screw down thru the hole in upper valence to adjust the headlight pod up or down. I tried to turn it but it was really hard and I didn't want to strip anything. I notice there is another star screw pointing to the front of the truck but there seems to be no way to access it. I'm assuming this screw needs to be loosened before turning the vertical adjusting screw? Or, how do you adjust the headlights on this vehicle?