A picture of the mold for the base of the yo-yo is shown below. Some key features, such as the sprue, the runner, the center shaft, and the ejector pin holes, are labeled. A more detailed description of the base mold and the base part can be found in an earlier post, "Yo-yo base: An injection molded part."Since the base is the largest part, we are going to try to avoid needing to change the base. If there need to be adjustments for snap fits, we shall adjust the earth cap mold or the ring mold, keeping the base the same.
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