Has to do with getting smaller ID then what is offered in copper. When you drop down below 0.026" ID, the only option I could find was SST as used for chromatography. Lab Express Management CO has quite a few selections to choose from, with the smallest being 0.005" ID.
Judging by what I saw when I disassembled a CryoTiger condensing unit, I will need a very small cap tube to do what I am after.
CRYOTIGER.jpg
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