"Why do you need your enlarger aligned this precisely? A bubble level will get you within less than a degree; unless you're printing wide-open (and why would you?), that slight a mis-alignment should be covered by depth of field, no? "

most high-end APO lenses were designed to be used wide open, same with point-light heads. Than again some children like to play with their food.

two things I just don't get:
1) an optical lens does not bend/move a laser beam so you're not aligning the lens to the carrier or baseboard
2) the alignment changes up and down the column

the best choice is a Salthill Tri-linear alignment tool but they are rarer than hen's teeth.