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Presuming the vacuum in the tube is still sufficient to allow the tube to work...
There's been a number of ideas mostly predicated on failure of the rather large metal to glass bonds. The concept was originally to apply a sealant like Vac-Seal to the seams.
However, a number of fellow enthusiasts have found that the weld between the two metal sections comprising the ultor ring is also a point were leaks can occur. In this case, nickel plating the ring would theoretically seal the micro sized leaks in the weld.
Good luck.
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