How do you zero these? Never fired a Mauser but I owned a Moist Nugget and the asshole that owned it before me welded a shitty backsight on and I couldn't adjust it. Can you adjust left/right/up/down?

This is just a pic from hickok45's Mauser vid, not sure which kind the tranny had. https://www.youtube.com/watch?v=3FcmQoTw5LA