Because I am a cheap bastard that wants to use the endcaps of the vacuum chamber as Anode and Katode, instead of messing around with sparkplugs or similar, I need an electrical insulator for my vacuum pump, because the KF16 vaccum line is all metal. Otherwise, the pump would sit at 500V potential.

Buying a ceramic insulator is out of the question, and a glass insulator is expensive (could easily reach 100€, SUPPOSING that the selling company wants to do business with an individual) So, I bought borosilicate tube and set my lathe to slow cooking.

Glassworks Part 1:

https://electronicmercenary.wordpress.com/2018/03/25/glassworks-preview/

Glassworks Part 2:

https://electronicmercenary.wordpress.com/2018/03/26/glassworks-2-the-dos-and-donts/