[SyzygyRhythm]

The article mentions that thin-walled copper tube can be used, but then says a precision lathe is required. But you can easily buy off-the-shelf copper tube with 1.6 or 2.0 mm diameter and 0.5 mm wall thickness. Is that not thin enough? If not, could one chemically thin the walls (acid, electrolysis) until it is enough?

[mgc_mgc]

In this case a glassworking lathe is needed to align and bring together the copper and glass tubes while the seal is being made.