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Interesting.
If one vacuum lie is so brittle it cracked ,what about all the others if they are the same age & have endured the same heat cycling ?
Pelican sell a vacuum hose kit but I had wanted to find a set that are a better grade of plastic. In theory silicone may work for the small diameter hoses if you get a thick wall? It has a tendency to collapse under high vacuum when hot. So the cheapo EBAy ,thin wall silicone hoses would be a bad choice.
For smoke testing the vacuum system I recent;y upgraded to a better quality paint+can+baby+oil system.It works well because it pushes ut a lot of smoke for a long period consistently.
Thanks for letting us all follow your progress.
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