Originally Posted By: who meI remember something about standing the scope on a mirror objective down. While looking through eyepiece you would see two sets of crosshairs in the reflection of the mirror. You would then adjust the windage and elevation until you saw only one set of crosshairs. I never tried this, maybe someone else will also remember reading about doing that.
+1 tried mounting it and dialing it and ran out of adjustment, used the mirror got me back to "center" or what is called mechanical zero.