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My Bob Jackson did this due to having been crashed and the forks shunted so the dropouts were slight to the right. 531c steel and only a minor misalignment so the forks were repairable.
Take out the forks and lay them flat on something like a tiled floor or lino with parallel lines. That's how I was most easily able to see the steerer tube not being in line with the axis of the fork legs.
Or it could be something else.
New (second hand bike), the fork by preference keeps turning to the left when I push it/roll it at low speeds, any ideas why?
I am imagining a cracked steerer, but I hope one of the aheadset races is pringled or something less severe