What? You post about a 1938 Bianchi, but won't take a pic of the whole frame for us? 😋😁 Sorry, someone had to say it. 😉
I agree with the soaking everyone recomends, but I'll give you a different approach, for holding the fork still. Just get a large piece of PVC pipe, or maybe wood, to sit the forks over, by straddling the 2 legs over the pipe or wood. If you get a good long section, you can brace it, like against a wall or something. You'll get way better leverage, if trying to twist it. 👍