I glued on two bases this weekend, using flowable silicone like Bob Anderson recommended also in a previous thread.
http://www.videokarma.org/showthread.php?t=267995
See attached picture of the silicone tube with pierced end - a 1/16" bit drilled from inside out. To mate with the nozzle, a very carefully dremel-drilled 9/64" hole in the BLANK pin 8 and 10 positions of base was the injection point.
CRT is face-down during process, curing in 24 hours. It was tight this AM. I did one of them warm, just off the CRT tester. The other at basement temp. Will see which holds.
Half a tube was used on each base in one hole and it flowed in and around the base closest to the CRT glass. Most or all of the wires going into the CRT may be covered also. Looking into the second hole, it was showing a rising level of silicone.
CRTs were both RCA 21FJ color roundies and bases were just loose enough to risk lead wire fatigue when socket is pushed on-pulled off. Oddly enough, no silicone flowed out where base meets glass on either one. Once solid, another test then re-flow solder into the pins to finish.