Re: 1930 Tudor Sedan
Check all the ball joints [ drag link ; tie rod etc] & make sure they are firm but not tight. Next drop radius rod under bell housing & check it has all the original springs & collars ; it must be able to flex, not be rigid. Check steering box is tight at chassis & pitman arm is tight at 'box.
I would read over one of the Model A maintenance books first unless you can do this all in your sleep.
I used to have this problem years ago, but correcting the above items cured it. Basically, adjusting the steering box reduces play & improves steering & driveability, but will not always help to eliminate shimmy. Cheers.
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