[morzh]

Take the grid cap.
While holding it with long thin needlnose pliers, Heat the solder on top well so it melts, and shake it once vigorously over your garbage can.
See if the small hole in the midde appeared.

If it did, look at the wire coming out of the tube's center, if the glass is intact around it and if it is straight.
Do not try to straighten it unless really mushed. It is stiff and when you place the cap back it should protrude through that hole just a little. If it does appear in the hole but does not go through, heat the cap a little so it does let the wire through.

Then using rosin core solder flood the top of the cap, making sure th vwire wets well.