I think what FJK is showing in his video are called BNC (British Naval Connections). They are used with Coaxial cable. When I typed that in on the shack sight I got 52 items. I have also seen these at home depot in the electrical isle with the switches and home entertainment wiring. You could also check out the brass air compressor connections
Part of why a crystal chamber is considered a right of passage is because its very much "free form", you have to exercise your creativity, you won't be buying 'chamber' parts and slapping them together. The other aspect is that it will take up space in the hilt this forces you to practice your cram-fu skill. Don't get fixated on "getting the right part", some of it will need to be hand made.
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