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Finally! Something more like a nixie tube 😉 I made a test tube what will be possible to pump and fill with gas and than isolate by a glass high vacuum valve. I will test with it right pressures, gas mixtures, electrode distances and many many more.. Pictures of glowing numbers will follow soon!
The black stem is made of POM plastics (on metal lathe), there is a rubber o-ring pressed by the glass tube what forms vacuum tight seal. These two parts holds together just by atmosperic pressure. The four pins are made from stainless steel bikespokes. The holes were drilled first and than the pins were pressed into them, should be vacuum tight (not tested yet).