Keeping a 15GP22 alive

[colorfixer]

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.