I am tearing my hair out... I have my dish properly mounted and the motor works but HOW DO I AIM IT? There is a scale labeled "ELEVATION" which I cannot move with my wrench pliers, and there is a scale named "A" and one named "B" that also move the dish up and down. The numbers on the motor don't go past 90. I don't even know what they mean. I don't have a compass. HELP PLEASE