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The first thing I’d check is tire pressure. I run 45 lbs in my ’31 Model 42.
If that doesn’t do it you can try about 1/4 turn on your tie rod in the direction of decreasing toe in. I had a nasty shimmy on my ’31 that started at about thirty and I had to slow to 5 mph before it went away. A friend suggested that I try the 1/4 turn and I mistakenly went the wrong way and increased the toe in. The shimmy was immediately WORSE, so I knew I had something. I wound up with a 1/3 turn adjustment to reduce toe-in and the shimmy was gone until my tire pressures dropped below 40 lbs. and then I’d get a hint of it again. My kingpins and tie rods are all tight, by the way.
Food for thought.
Bill