the pink part (the colour of the dot) is the rubber insert that is in the end of the brass tube chamber. It captures and forms a seal with the end of the nozzle.
When I refer to the "tip" of the nozzle, I'm referring to the first 5mm or so of it. The part that is red in the MS paint picture. Reduce the diameter for a good fit...not shorten it, hahaha.
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