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Not more fragile, just more susceptible to losing vacuum if you ding the rim where it's welded together. It's more of a concern when the tube is out of the set, in it's rightful place, it's just as good as an all glass one. Yes, they are very hard to find. Ask Mark how long he waited for one for the Wingate, and how much he gave when one came his way...
I got lucky, an ARF member sent me one for the cost of shipping. Said he didn't know if it was any good, and mailed it Greyhound uncovered in a ratty cardboard box. Made it just fine, and it's still happy in my CTC-4. Thanks, Tom!
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Evolution...
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