I posted this question over on the mechanics forum but thought I'd put it here too, since I don't "know" anybody over there.

I just replaced the head set on a bike I acquired. Head set was and is Campagnolo Nuovo record. I made tools to press in the new cups. Went very well. However, when I installed the new crown race I notice it didn't seat all the way. There is a very small gap, maybe 1/2 mm, on one side between the crown race and fork crown. The rest of the race, about 340 degrees worth, seems to be seated tight. I'm wondering if I could have somehow, inadvertently, tweaked the steerer tube ever so slightly.

I've been looking at fork alignment jigs on Google but would hate to have to go to that extent just to check one fork. Is there a "simple" way to check that the steerer tube is properly aligned with the fork blades? Thanks.