it is no surprise to me about the quality of rubber. I was working for a collector years back & every other month I would do my "service station routine" check oil & tires bla bla bla on up to 20 cars THE ONLY TIRES THAT NEVER NEEDED AIR WERE THE STOCK SPARES.
it would make sense to me that when the actuator does its flip flop one side has to exhaust. & something has to be a valve.
To me any vacuum leak is not a good one. ( I can just imagine when they had Vacuum powered door locks how much fun that was)
I like the Idea of a shrink tube on the end ,maybe the manufactures can upgrade the design to make the shrink tube part of the boot.
I'm still thinking A "O" ring or 2 would hold it the problem there is how long with the crappy "O" ring rubber last?
Next time i'm in a bone yard & see a corvette i'm gunna pay more attention to those pop up lights.
What a innovative group of engineers Pontiac had in the 50's 60's & 70's.
Pretty sneeky sis.
SR66
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The best proof that there is intelligent life in outer space is;that they haven't made contact 