yep. for that wee rig it should work just fine…
see: 500ml or 2L - #17 by cyclopath for illustration.
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Thanks for the tip, @cyclopath in the links you gave me glass stopper 10 18 - Google Search Did you manage to see anything? I don’t😁
yes and no.
there are at least a couple of lab glassware links that come up on the first page with that search.
at least one I checked had stoppers, but only in 10/19.
came to the conclusion that the Italians either use their very own set of stopper sizes, or call them differently.
figure that’s and exercise for the reader 
Edit: (my reading of that link suggests it’s just a nomenclature glitch, but only way to know it to try it…
).
Still reckon that 12mm ptfe rod in a variable speed drill with a sharp tool and a steady-rest would solve it.
Not certain you couldn’t just warm the joint just right and stuff it in!!!
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First learning test, this is my setup, 50ml boiling flask with about 15 grams of bho concentrate, Chinese mantle, china distillation head dry run, 9 cfm 1hp two stage rotary vane pump. No right pressure gauge to avoid any leaks, despite this my condenser and the receiving balloon are always dry, what suggestion do you give me?
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Forgive my google translator.
I know perfectly well that the temperature is too high, I went to this temperature to try to understand if the fault is the pump, the material to be distilled or the distillation head? The pump gives it about 17 or 12 microns.
The probe is inserted between the mantle and the balloon