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Some time ago my Duuti pump broke. The Schrader (AV) pin (valve enabler) broke and fall out. This was not a huge problem for me, since i use Dunlop (DV) valves in my bike. Although, yesterday i had to pump AV bike tube, so i made two replacement parts for easy fix. File duuti_2.stl is an actual AV pin, which seats in duuti_1.stl distance ring with reverse blow seal in between. Reuse it from Your broken part or cut out rubber circle 5mm in diameter and 1mm thick - should do just fine.
