I think this thread is coming back to haunt me, lol.
Today, months later I was finally able to pull one of my caps off. It took quite a bit of pulling, but it still came off and that makes me really uncomfortagle. However, it wasn't put on with multi-temp hot glue, but hot temp, which isn't supposed to work as well on certain things. Oh well, you live and learn, right?
I LOVE, LOVE, LOVE the wooden disc idea and will be picking some up the next time I'm out! I may resort to E6000 just to be sure on things, but you can be sure I'll be putting them out in the garage to dry so I don't have to get 'high' on the fumes!