not an expert opinion since it's the first time i'm seeing the choke plunger like yours, but suppose that you're right - there should be that pointy bit, seems that it works as a guide.
and the shape of your plunger says quite loudly that it needs to have some rubber on it )
it's interesting that "straight" plungers (left one on the upper pic) seem to have same diameter "jamming cylinder", but normally they do work without any o-ring.
who knows, maybe different materials and/or more snug fit of the working surfaces...
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