[johnbuckley]

Shimmy/wobble can be caused pretty much by anything between the front tires and the steering wheel: balance, wheel bearings, kingpins, axle, tie rod ends, drag link ends , drop arm , steering box. It often case of checking /tightening things until it goes away.... (PS IMHO just 1-2 inch of steering wheel play is very good for a Model A that's used and not sitting in a museum!)