Out of curiosity, how do you all pop the bell off your Heron? I have a difficult time on my v2 so I don't change flavors often.
I usually stick a pencil/pen into the chimney of the bell and push while pulling down on the tank cylinder while holding onto it with rubber bands.
It takes a lot more force than I would have expected. If you're taking votes, I vote for a threaded bell that I can unscrew with a hex key or something like the old Spheroids.
(edit: I also put a bit of eliquid on the o-rings before reinstalling the bell but it doesn't seem to have much effect)
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I use the GP Fork