www.rodbuilding.org is the best forum site on the planet for rodbuilding.
Just wrap the guides on and then align them. Real simple way is the align
the tip top so that the blank splits the ring in half, than do the same with
the other guides. Works best highlighted against a light colored wall or
something. This will give you a straight guide set even if the blank has a
slight bend someplace, trying to get a straight set sighting down them from
the top, especially if you have a slight dip in the blank, is a nightmare.