The tri nozzle can't be firmly affixed to the cocking bars because it has a total travel of only 1/2" wheras the cocking rods move around 5".
The point of the return spring on the nozzle is to keep the nozzle following the bars in the first 1/2" of forward return so the bbs are fully breeched and opening to the breech closed by the time that the loading latch opens the up tube. If a 4th bb manages to sneak in because the nozzle is stuck open, the nozzle remains jammed open by the extra bb until the gap in the cocking rods ends and forcefully pulls the nozzle forward in the end of the forward stroke.
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