When your changing scope settings and want that shot to work with low end stuff you will get closer to expected poi by tapping the windage and elevation knobs with a tool. It will help seat the mechanism.
Having adjustments that track true is a big part of higher dollar scope costs.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith