Defective unit - ADCO E-Dot Red Dot Reflex Sight

The elevation screw is very unstable. First off the arrow indicates rotate left to elevate. It is backwards. To elevate bullet hit on target must rotate in the opposite direction. Had to rotate the screw two revolutions to begin to elevate hits on the target. Feels loose and think it is not going to hold the setting. I bought this unit 2-3 years ago and just now have installed on new 22LR handgun and test fired. Very disappointed I probably have no warranty claim. My fault for not checking it out when received. Expected good quality when new. Live and learn.