Originally Posted by Doug Fattic

Ordinarily this fork alignment job is done by a framebuilder. There are 4 factors involved. 1st it is to get the rake back to original. That is the fore aft alignment. The rake needs to be the same on both sides. 2nd is the side to side alignment. The front dropouts need to be equidistant from the steerer's centerline. Framebuilders have fixtures for these checks. However I don't bend the blades in the fixture, I bend them outside the fixture and use the fixture to check. Gloves help. 3rd, the dropout faces need to be parallel to each other. There are dropout alignment tools for this job. They are sometimes referred to as "H" tools because that is how they were designated in old Campy catalogs. They were the tool between G and I.
Once the fork has those 3 alignments, it can now be checked that a wheel centers exactly. There are a couple of solutions to do that including filing one of the DO slots. Most frame builders charge a reasonable fee to do this and it can be done while you wait.