not only that but most of the industrial knowledge of exactly how to make them is dead. there used to be 10's of thousands of people if not 100's of thousands with knowledge of the processes involved, now there are just hundreds.
Most of the industrial equipment used to make them is long gone too so people attempting to make them now have to relearn and reinvent the processeswith only theory as their guide. There was a guy in Germany who had to reinvent the process to make dixie tubes just because he wanted some and ended up making a whole company producing them at a small scale.
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IIRC they're tough to make these days because of emissions standards which is why they're so expensive
not only that but most of the industrial knowledge of exactly how to make them is dead. there used to be 10's of thousands of people if not 100's of thousands with knowledge of the processes involved, now there are just hundreds. Most of the industrial equipment used to make them is long gone too so people attempting to make them now have to relearn and reinvent the processeswith only theory as their guide. There was a guy in Germany who had to reinvent the process to make dixie tubes just because he wanted some and ended up making a whole company producing them at a small scale.