Lol. Me too, me too.
BZ doesn't have centering pots. The manual states to adjust centering on the yoke of the monitor.
Some find this easy. I do not. Arguably the one game that most needs centering pots, to align with the backdrop, and Atari cheaps out.
That said, those spots are actually there on the PCB, but unpopulated. It's apparently a relatively easy mod to add them to BZ.