Beautiful precision hand work, almost like a ballet.
As a mechanical engineer myself who has spent many hours among production teams, I was lost in admiration for the person who is behind the project.
This kind of dedication to production is found in Switzerland, where I was employed in an engineering firm for 25 years.
Just imagine the years of effort in finding the raw materials, developing the the production process, selecting all the production equipment and training the skilled hand workers.
Having watched the many process steps involved, I suspect that the cost of each tube is going to be high - but they seem to have sufficient customers to support the business.
Many thanks for posting the video.
eric j