And remember, there is backlash on the floating pin (there is backlash on all of them but the only one that it matters on is the floating pin, because you are moving it). ONLY set it by turning in one direction... if you go past a setting and then turn the other way to go back, you will be at a different spot than if you turned right to the setting. My XR sight, for example, the floating pin has ~5 degrees of backlash on the knob.