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I'm going to ask a stupid question here...
When a tube goes gassy like that, does it have to be rebuilt? What prevents you from heating up the nipple under the tube cap, attaching a new piece of glass, re applying the vacuum, and resealing it? From my view it seems like a lot of these tubes have very, very slow leaks, which makes me wonder how hard it would be to periodically "top up" the vacuum.
-J
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