I remember occasionally encountering similar problems in the days of brake-mounted reflector brackets, but in your case, I think you'll need to add a washer.
David Snyder
Auburn, CA usa
> So I was just putting the finishing touches on my 74 Serotta. I took it
> off the stand and found the headset was very stiff. Back on the stand
> and fiddled around but couldn't get it right. I finally decided to take
> it completely apart and as I began disassembly, I found the problem was
> the top of the brake centerbolt was rubbing the edge of the lower head
> race.
>
> Suggestions please?