First, the picture. Then the thousand words. tldr: how to extract the rubber stopper. Last night, whereby I resolved to clean this piece with PBW, and, grabbed a rubber stopper, must have been 10mm, because it fell through and became lodged, and, piercing it with a needle couldn't pull it out. Then I shook it for no good reason, which caused the stopper to turn around. How do I get this out?