I just opened the box for a new Zeiss Conquest HD5 3-15x42, and I can't turn the side adjustment knob. I can lift it and turn it to reset the zero, but I can't turn it. It just doesn't move or click. The elevation knob clicks like it should and the parallex adjustment knob moves, but not the side knob. Is there a trick to this or is the scope defective?


















































