I'm back :greetings-waveyellow:
I've banged a tryout very roughly together enough to see how it is supposed to work.
Bottom plate: pretty normal downcomer in the middle. The holes around the edge are for rising vapours (should really be as big as possible or even curved slots)
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Bubbly bit: pretty much just an inside-out bubble cap
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Inside the still they would fit together like this The outside wall of the still forms part of the riser.
20170801_210004.jpg
Looking from the bottom. It really looks like it needs those holes joined together, looks really restrictive atm.
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Assembled looking in from the top
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Had tried to make the "bubbly bit" a pretty tight fit in the still tube so it would not need sealing. Will see, may have to solder it in or seal it some other way. Now I think about it, it will need a dab of solder to hold it in place or it will rattle around like crazy.
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