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looks like the plastic guide has been pulled off. First, make sure the tube isn't cracked there aywhere (I think there is usually a nipple there that might be missing". If everything looks solid, straighten the pins with some needle-nose pliers before trying to put the neckboard on. And make sure you get the focus pin in the focus slot when you do...
tube's cactus.. glass degassing nipple is missing, probably find something has hit the neckboard, bending pins and knocking the plastic key off.
If you hook it up, all they do is hiss and arc internally. They don't bite you tho.
To dispose of them, I carefully tap the nipple off to let the air in to render them safe and then smash them up in the wheelybin/rubbish bin, so they take up less room.
Ive got the degaussing nipple, found it in the bottom of the cab last night. There is a small trace of glass around the base, where I'm assuming it was glued to the tube originally. Aside from that I'm not seeing any damage.
I'm going to look to see if there's a good glass glue or epoxy at HD at lunch time, and I'll see if I can get this bugger back on there.
If you found the glass nipple...sorry to say, that tube is garbage. No amount of epoxy will get the vacuum back. Sorry.
Edward
Look up into the end of the tube...where the neckboard goes....in the center of all those bent pins. It should be sealed....that's where yours is broken. I bet on yours....you could physically stick a small screwdriver up into it. You're going to get one hell of a light show when you fire that up....I recommend doing it with the lights turned off. Light shows always look best in the dark
Edward
The plastic piece is fine. I've actually seen tubes where the glass nipple broke off, but didn't create a vacuum leak in the tube because the nipple was longer or whoever blew the tube had it a little thicker there under it....