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Well John, after seeing that diagram and cross section I gotta say it's a miracle there are any working 15G's at all.
So many potential trouble spots.
What was the purpose of the double wall of thin metal?
It looks like possibly it was to allow for different expansion rates between the bell and the face plate, is the corrugated washer welded to anything or just squeezed between the two pieces to provide some tension?
Would it be possible to pressurize the tube slightly with an inert gas and simply look for leaks with soapy water like you would a tire? I suppose it would have to be a pretty large leak to find it that way, also I don't imagine you could put much pressure inside without exploding the thing.
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