I have a Sunbeam Mixmaster from mthe 1970s,
If this mixer sits on a stand, first remove it from the stand. Turn it upside down and shine a flashlight into the right side socket to look for obstructions. When you say you swivel the head, do you mean you rotate the handle? This is how to eject the beaters after use. It may be that the ejector on the right side is stuck. If so, you will need someone with mechanical skills to disassemble & repair.
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