I seem to have a hard time mounting my scopes, so that the reticule is perfectly level on the weapon..... When I thighten down one set of screws, even though I torque each screw only a small amount each time, on each side, I still seem to get the reticule pulled in one direction or the other. Sometimes taking a number of times to get it close (level). Is there a better way to ensure the reticule is level?

Thanks,
Desert