Quick overview of minor alignment techniques.
I hope you have a focus rod.
If you have a wider focus rod, set your mags on 8 and check the space on each side of the bar to see if your head is centered.
If you have a thinner focus rod, set your mags on 12 and check the space on each side of the bar to see if your head is centered.
If you have to move your head, just slightly loosen enough to move from side to side. But check your focus to make sure you haven’t moved it forward or backward.
If not in focus: set your mag on the highest mag and move the head froward or backward to get clear focus. If you are in focus on the highest mag, you should be in focus on all other mags. If not, your arms might be bent.