here's a possible ghetto safety tip that has worked for swim:
after putting the 4 ingrediants together in the flask, out-side, allow a few seconds for the homongenous mix to liquify and generate a tiny amount of gas to drive out the air in the flask. then cap the flask w/ condensor/ and or balloon. there will bee less O2 and less pressure for the long slow ride that follows.
actually, the entire dream can bee done with negative pressure.
quite nicely.
implosion beecomes the new concern, which, imho, is far less likely with round glass than explosion. the curves in the glass ware have compressive strength in spades; tensile strength is nominal.
