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The gun isn't the problem, it's the shadow mask. If that has rusted or deformed, the tube's junk no matter how many guns you put in it. Getting the old gun out would confirm the extent of the damage, as you'll be able to see down the neck and have a look at the condition of the mask.
And yes, I can weld these tubes successfully. If there's a leak, it would be a lot easier to fix than on a 15G. With the 15G you'd have to frit treat the glass/metal joints first, then weld the metal seam of any pinholes.
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Evolution...
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