Gentlemen the Google is not strong with me today and I'm unable to find anything on how to reset the zero stop on a used Atacr that I've recently bought. after mounting I'm shooting 7" high at 100 yards with a 20 moa base. The instructions tell how to set the zero stop when there is plenty of travel with a new scope but doesn't address resetting it if you need to go below zero. Anyone done this before?