Well, I finally scored a Silex vac pot with the Silex Lox-in glass filter. I first tried the Lox-in on my Hario 3-cup, and it stalled. The next time, I backed the grind from 1 to 2 on my Flying Eagle grinder, and it came down just fine. The cup was richer than with the cloth filter.
Yesterday, I tried the 8-cup Silex stove-top, and assured my wife that the glass pot would not shatter on the stove (I was gritting my teeth the whole way). As the water went up the tube, the top bowl popped out of the rubber gasket!!! I pushed it back on and finished the brew. When I took it off the stove and the coffee went back down, I tried to remove the top bowl, and, yes, the gasket stayed firmly in the lower pot. I had to wait a few minutes for the coffee to cool enough to get my hand in and pull the gasket out.
So, here is the question: How can I afix the gasket to the upper bowl? Food-safe super-glue? Nah... Will it just stick to the upper bowl the longer I use it, or stick less to the lower pot?