I've know a guy who had a PA and would retract fully inside like you or me. Depending on the size of the ring he was wearing it did pretty much what Stoutman says. The larger one, about 1 inch in diameter, would keep the head out while the smaller ring, about 1/2 an inch, would get pulled in with it. He sometimes also wore just a pin through the piercing and that got pulled in as well.
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