cyclingcolors 20x Screw Cover Cap M5 Black Plastic Hexagon Allen Head Hole Socket Hex Protector Furniture Screws caps https://amzn.eu/d/isEWV47 Plenty of other sizes available
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As others have said, I don’t think Cinelli stems have ever had a cap on top and I have owned a lot of them. Also mentioned above, some 3TTT stems did have one.