I had a crash at approx. 5 mph; the front wheel got caught in a crack in the road, then rapidly turned to the left and I went down. I got up and rode on. The front wheel is slightly bent but spins without touching brake pads, nothing else seems wrong - until I sit up and take my hands off the bars. Unstable, whereas before the crash it was rock steady. I'm guessing this is a fork issue. The bike is 531 frame and fork in a large (62cm) frame from 1981.

So the question is - how can I check fork alignment? Can it be done without disassembly? or should I just take this to an experienced shop or a frame builder?