Above, you see the heads of a Type 1, Type 2, and Type 3 body (below you see the corresponding bodies and neck joints that go with them).
Type 1 has a very small neck hole, but since it goes through the entire neck, it's thicker than the other two, which have an outside and inside hole. The neck peg is small and thin.
Type 2 has a large round hole on the outside, with a slightly smaller, also round hole set on the inside.The neck peg has a thick core, with a flat top. The neck is round, but soft and retractable.
Type 3 has a slightly smaller outside hole than Type 2, and is oval. The inside hole is larger, but it only has a rim on the front that slopes into the sides and none in the back. The neck has a medium thick core with a flat top, and is slightly oval.
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